diff --git a/include/llvm/ProfileData/InstrProfData.inc b/include/llvm/ProfileData/InstrProfData.inc
index a3b5471..e1e2df5 100644
--- a/include/llvm/ProfileData/InstrProfData.inc
+++ b/include/llvm/ProfileData/InstrProfData.inc
@@ -249,22 +249,22 @@
 #define INSTR_PROF_DATA_DEFINED
 INSTR_PROF_SECT_ENTRY(IPSK_data, \
                       INSTR_PROF_QUOTE(INSTR_PROF_DATA_COMMON), \
-                      INSTR_PROF_QUOTE(INSTR_PROF_DATA_COFF), "__DATA,")
+                      INSTR_PROF_DATA_COFF, "__DATA,")
 INSTR_PROF_SECT_ENTRY(IPSK_cnts, \
                       INSTR_PROF_QUOTE(INSTR_PROF_CNTS_COMMON), \
-                      INSTR_PROF_QUOTE(INSTR_PROF_CNTS_COFF), "__DATA,")
+                      INSTR_PROF_CNTS_COFF, "__DATA,")
 INSTR_PROF_SECT_ENTRY(IPSK_name, \
                       INSTR_PROF_QUOTE(INSTR_PROF_NAME_COMMON), \
-                      INSTR_PROF_QUOTE(INSTR_PROF_NAME_COFF), "__DATA,")
+                      INSTR_PROF_NAME_COFF, "__DATA,")
 INSTR_PROF_SECT_ENTRY(IPSK_vals, \
                       INSTR_PROF_QUOTE(INSTR_PROF_VALS_COMMON), \
-                      INSTR_PROF_QUOTE(INSTR_PROF_VALS_COFF), "__DATA,")
+                      INSTR_PROF_VALS_COFF, "__DATA,")
 INSTR_PROF_SECT_ENTRY(IPSK_vnodes, \
                       INSTR_PROF_QUOTE(INSTR_PROF_VNODES_COMMON), \
-                      INSTR_PROF_QUOTE(INSTR_PROF_VNODES_COFF), "__DATA,")
+                      INSTR_PROF_VNODES_COFF, "__DATA,")
 INSTR_PROF_SECT_ENTRY(IPSK_covmap, \
                       INSTR_PROF_QUOTE(INSTR_PROF_COVMAP_COMMON), \
-                      INSTR_PROF_QUOTE(INSTR_PROF_COVMAP_COFF), "__LLVM_COV,")
+                      INSTR_PROF_COVMAP_COFF, "__LLVM_COV,")
 
 #undef INSTR_PROF_SECT_ENTRY
 #endif
@@ -654,13 +654,15 @@
 #define INSTR_PROF_VALS_COMMON __llvm_prf_vals
 #define INSTR_PROF_VNODES_COMMON __llvm_prf_vnds
 #define INSTR_PROF_COVMAP_COMMON __llvm_covmap
-/* Win32 */
-#define INSTR_PROF_DATA_COFF .lprfd
-#define INSTR_PROF_NAME_COFF .lprfn
-#define INSTR_PROF_CNTS_COFF .lprfc
-#define INSTR_PROF_VALS_COFF .lprfv
-#define INSTR_PROF_VNODES_COFF .lprfnd
-#define INSTR_PROF_COVMAP_COFF .lcovmap
+/* Windows section names. Because these section names contain dollar characters,
+ * they must be quoted.
+ */
+#define INSTR_PROF_DATA_COFF ".lprfd$M"
+#define INSTR_PROF_NAME_COFF ".lprfn$M"
+#define INSTR_PROF_CNTS_COFF ".lprfc$M"
+#define INSTR_PROF_VALS_COFF ".lprfv$M"
+#define INSTR_PROF_VNODES_COFF ".lprfnd$M"
+#define INSTR_PROF_COVMAP_COFF ".lcovmap$M"
 
 #ifdef _WIN32
 /* Runtime section names and name strings.  */
@@ -676,31 +678,18 @@
 #define INSTR_PROF_COVMAP_SECT_NAME INSTR_PROF_COVMAP_COFF
 #else
 /* Runtime section names and name strings.  */
-#define INSTR_PROF_DATA_SECT_NAME INSTR_PROF_DATA_COMMON
-#define INSTR_PROF_NAME_SECT_NAME INSTR_PROF_NAME_COMMON
-#define INSTR_PROF_CNTS_SECT_NAME INSTR_PROF_CNTS_COMMON
+#define INSTR_PROF_DATA_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_DATA_COMMON)
+#define INSTR_PROF_NAME_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_NAME_COMMON)
+#define INSTR_PROF_CNTS_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_CNTS_COMMON)
 /* Array of pointers. Each pointer points to a list
  * of value nodes associated with one value site.
  */
-#define INSTR_PROF_VALS_SECT_NAME INSTR_PROF_VALS_COMMON
+#define INSTR_PROF_VALS_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_VALS_COMMON)
 /* Value profile nodes section. */
-#define INSTR_PROF_VNODES_SECT_NAME INSTR_PROF_VNODES_COMMON
-#define INSTR_PROF_COVMAP_SECT_NAME INSTR_PROF_COVMAP_COMMON
+#define INSTR_PROF_VNODES_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_VNODES_COMMON)
+#define INSTR_PROF_COVMAP_SECT_NAME INSTR_PROF_QUOTE(INSTR_PROF_COVMAP_COMMON)
 #endif
 
-#define INSTR_PROF_DATA_SECT_NAME_STR                                          \
-  INSTR_PROF_QUOTE(INSTR_PROF_DATA_SECT_NAME)
-#define INSTR_PROF_NAME_SECT_NAME_STR                                          \
-  INSTR_PROF_QUOTE(INSTR_PROF_NAME_SECT_NAME)
-#define INSTR_PROF_CNTS_SECT_NAME_STR                                          \
-  INSTR_PROF_QUOTE(INSTR_PROF_CNTS_SECT_NAME)
-#define INSTR_PROF_COVMAP_SECT_NAME_STR                                        \
-  INSTR_PROF_QUOTE(INSTR_PROF_COVMAP_SECT_NAME)
-#define INSTR_PROF_VALS_SECT_NAME_STR                                          \
-  INSTR_PROF_QUOTE(INSTR_PROF_VALS_SECT_NAME)
-#define INSTR_PROF_VNODES_SECT_NAME_STR                                        \
-  INSTR_PROF_QUOTE(INSTR_PROF_VNODES_SECT_NAME)
-
 /* Macros to define start/stop section symbol for a given
  * section on Linux. For instance
  * INSTR_PROF_SECT_START(INSTR_PROF_DATA_SECT_NAME) will
diff --git a/lib/Transforms/Instrumentation/InstrProfiling.cpp b/lib/Transforms/Instrumentation/InstrProfiling.cpp
index 295273b..e77427a 100644
--- a/lib/Transforms/Instrumentation/InstrProfiling.cpp
+++ b/lib/Transforms/Instrumentation/InstrProfiling.cpp
@@ -677,22 +677,6 @@
   return F->hasAddressTaken() || F->hasLinkOnceLinkage();
 }
 
-static inline Comdat *getOrCreateProfileComdat(Module &M, Function &F,
-                                               InstrProfIncrementInst *Inc,
-                                               const Triple &TT) {
-  if (!needsComdatForCounter(F, M))
-    return nullptr;
-
-  // COFF format requires a COMDAT section to have a key symbol with the same
-  // name. The linker targeting COFF also requires that the COMDAT
-  // a section is associated to must precede the associating section. For this
-  // reason, we must choose the counter var's name as the name of the comdat.
-  StringRef ComdatPrefix =
-      (TT.isOSBinFormatCOFF() ? getInstrProfCountersVarPrefix()
-                              : getInstrProfComdatPrefix());
-  return M.getOrInsertComdat(StringRef(getVarName(Inc, ComdatPrefix)));
-}
-
 static bool needsRuntimeRegistrationOfSectionRange(const Triple &TT) {
   // Don't do this for Darwin.  compiler-rt uses linker magic.
   if (TT.isOSDarwin())
@@ -700,7 +684,7 @@
 
   // Use linker script magic to get data/cnts/name start/end.
   if (TT.isOSLinux() || TT.isOSFreeBSD() || TT.isOSNetBSD() ||
-      TT.isOSFuchsia() || TT.isPS4CPU())
+      TT.isOSFuchsia() || TT.isPS4CPU() || TT.isOSWindows())
     return false;
 
   return true;
@@ -717,13 +701,44 @@
     PD = It->second;
   }
 
-  // Move the name variable to the right section. Place them in a COMDAT group
-  // if the associated function is a COMDAT. This will make sure that
-  // only one copy of counters of the COMDAT function will be emitted after
-  // linking.
+  // Match the linkage and visibility of the name global, except on COFF, where
+  // the linkage must be local and consequentially the visibility must be
+  // default.
   Function *Fn = Inc->getParent()->getParent();
-  Comdat *ProfileVarsComdat = nullptr;
-  ProfileVarsComdat = getOrCreateProfileComdat(*M, *Fn, Inc, TT);
+  GlobalValue::LinkageTypes Linkage = NamePtr->getLinkage();
+  GlobalValue::VisibilityTypes Visibility = NamePtr->getVisibility();
+  if (TT.isOSBinFormatCOFF()) {
+    Linkage = GlobalValue::InternalLinkage;
+    Visibility = GlobalValue::DefaultVisibility;
+  }
+
+  // Move the name variable to the right section. Place them in a COMDAT group
+  // if the associated function is a COMDAT. This will make sure that only one
+  // copy of counters of the COMDAT function will be emitted after linking.
+  Comdat *Cmdt = nullptr;
+  GlobalValue::LinkageTypes CounterLinkage = Linkage;
+  if (needsComdatForCounter(*Fn, *M)) {
+    if (TT.isOSBinFormatCOFF()) {
+      // There are two cases that need a comdat on COFF:
+      // 1. Functions that already have comdats (standard case)
+      // 2. available_externally functions (dllimport and C99 inline)
+      // In the first case, put all the data in the original function comdat. In
+      // the second case, create a new comdat group using the counter as the
+      // leader. It's linkage must be external, so use linkonce_odr linkage in
+      // that case.
+      if (Comdat *C = Fn->getComdat()) {
+        Cmdt = C;
+      } else {
+        Cmdt = M->getOrInsertComdat(
+            getVarName(Inc, getInstrProfCountersVarPrefix()));
+        CounterLinkage = GlobalValue::LinkOnceODRLinkage;
+      }
+    } else {
+      // For other platforms that use comdats (ELF), make a new comdat group for
+      // all the profile data. It will be deduplicated within the current DSO.
+      Cmdt = M->getOrInsertComdat(getVarName(Inc, getInstrProfComdatPrefix()));
+    }
+  }
 
   uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
   LLVMContext &Ctx = M->getContext();
@@ -731,14 +746,15 @@
 
   // Create the counters variable.
   auto *CounterPtr =
-      new GlobalVariable(*M, CounterTy, false, NamePtr->getLinkage(),
+      new GlobalVariable(*M, CounterTy, false, Linkage,
                          Constant::getNullValue(CounterTy),
                          getVarName(Inc, getInstrProfCountersVarPrefix()));
-  CounterPtr->setVisibility(NamePtr->getVisibility());
+  CounterPtr->setVisibility(Visibility);
   CounterPtr->setSection(
       getInstrProfSectionName(IPSK_cnts, TT.getObjectFormat()));
   CounterPtr->setAlignment(8);
-  CounterPtr->setComdat(ProfileVarsComdat);
+  CounterPtr->setComdat(Cmdt);
+  CounterPtr->setLinkage(CounterLinkage);
 
   auto *Int8PtrTy = Type::getInt8PtrTy(Ctx);
   // Allocate statically the array of pointers to value profile nodes for
@@ -752,14 +768,14 @@
       ArrayType *ValuesTy = ArrayType::get(Type::getInt64Ty(Ctx), NS);
 
       auto *ValuesVar =
-          new GlobalVariable(*M, ValuesTy, false, NamePtr->getLinkage(),
+          new GlobalVariable(*M, ValuesTy, false, Linkage,
                              Constant::getNullValue(ValuesTy),
                              getVarName(Inc, getInstrProfValuesVarPrefix()));
-      ValuesVar->setVisibility(NamePtr->getVisibility());
+      ValuesVar->setVisibility(Visibility);
       ValuesVar->setSection(
           getInstrProfSectionName(IPSK_vals, TT.getObjectFormat()));
       ValuesVar->setAlignment(8);
-      ValuesVar->setComdat(ProfileVarsComdat);
+      ValuesVar->setComdat(Cmdt);
       ValuesPtrExpr =
           ConstantExpr::getBitCast(ValuesVar, Type::getInt8PtrTy(Ctx));
     }
@@ -786,13 +802,13 @@
 #define INSTR_PROF_DATA(Type, LLVMType, Name, Init) Init,
 #include "llvm/ProfileData/InstrProfData.inc"
   };
-  auto *Data = new GlobalVariable(*M, DataTy, false, NamePtr->getLinkage(),
+  auto *Data = new GlobalVariable(*M, DataTy, false, Linkage,
                                   ConstantStruct::get(DataTy, DataVals),
                                   getVarName(Inc, getInstrProfDataVarPrefix()));
-  Data->setVisibility(NamePtr->getVisibility());
+  Data->setVisibility(Visibility);
   Data->setSection(getInstrProfSectionName(IPSK_data, TT.getObjectFormat()));
   Data->setAlignment(INSTR_PROF_DATA_ALIGNMENT);
-  Data->setComdat(ProfileVarsComdat);
+  Data->setComdat(Cmdt);
 
   PD.RegionCounters = CounterPtr;
   PD.DataVar = Data;
@@ -878,6 +894,10 @@
   NamesSize = CompressedNameStr.size();
   NamesVar->setSection(
       getInstrProfSectionName(IPSK_name, TT.getObjectFormat()));
+  // On COFF, it's important to reduce the alignment down to 1 to prevent the
+  // linker from inserting padding before the start of the names section or
+  // between names entries.
+  NamesVar->setAlignment(1);
   UsedVars.push_back(NamesVar);
 
   for (auto *NamePtr : ReferencedNames)
diff --git a/test/Instrumentation/InstrProfiling/PR23499.ll b/test/Instrumentation/InstrProfiling/PR23499.ll
index 101fad1..7f6bed6 100644
--- a/test/Instrumentation/InstrProfiling/PR23499.ll
+++ b/test/Instrumentation/InstrProfiling/PR23499.ll
@@ -20,8 +20,8 @@
 
 
 ; COFF-NOT: __profn__Z3barIvEvv
-; COFF: @__profc__Z3barIvEvv = linkonce_odr hidden global [1 x i64] zeroinitializer, section "{{.*}}prfc", comdat, align 8
-; COFF: @__profd__Z3barIvEvv = linkonce_odr hidden global { i64, i64, i64*, i8*, i8*, i32, [2 x i16] } { i64 4947693190065689389, i64 0, i64* getelementptr inbounds ([1 x i64], [1 x i64]* @__profc__Z3barIvEvv, i32 0, i32 0), i8*{{.*}}, i8* null, i32 1, [2 x i16] zeroinitializer }, section "{{.*}}prfd{{.*}}", comdat($__profc__Z3barIvEvv), align 8
+; COFF: @__profc__Z3barIvEvv = internal global [1 x i64] zeroinitializer, section "{{.*}}prfc$M", comdat($_Z3barIvEvv), align 8
+; COFF: @__profd__Z3barIvEvv = internal global { i64, i64, i64*, i8*, i8*, i32, [2 x i16] } { i64 4947693190065689389, i64 0, i64* getelementptr inbounds ([1 x i64], [1 x i64]* @__profc__Z3barIvEvv, i32 0, i32 0), i8*{{.*}}, i8* null, i32 1, [2 x i16] zeroinitializer }, section "{{.*}}prfd{{.*}}", comdat($_Z3barIvEvv), align 8
 
 
 declare void @llvm.instrprof.increment(i8*, i64, i32, i32) #1
diff --git a/test/Instrumentation/InstrProfiling/comdat.ll b/test/Instrumentation/InstrProfiling/comdat.ll
new file mode 100644
index 0000000..c3bb7be
--- /dev/null
+++ b/test/Instrumentation/InstrProfiling/comdat.ll
@@ -0,0 +1,38 @@
+; RUN: opt < %s -mtriple=x86_64-unknown-linux -instrprof -S | FileCheck %s --check-prefixes=ELF
+; RUN: opt < %s  -mtriple=x86_64-pc-win32-coff -instrprof -S | FileCheck %s --check-prefixes=COFF
+; RUN: opt < %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=ELF
+; RUN: opt < %s  -mtriple=x86_64-pc-win32-coff -passes=instrprof -S | FileCheck %s --check-prefixes=COFF
+
+; There are two main cases where comdats are necessary:
+; 1. standard inline functions (weak_odr / linkonce_odr)
+; 2. available externally functions (C99 inline / extern template / dllimport)
+; Check that we do the right thing for the two object formats with comdats, ELF
+; and COFF.
+
+declare void @llvm.instrprof.increment(i8*, i64, i32, i32)
+
+$foo_inline = comdat any
+
+@__profn_foo_inline = linkonce_odr hidden constant [10 x i8] c"foo_inline"
+
+; ELF: @__profc_foo_inline = linkonce_odr hidden global{{.*}}, section "__llvm_prf_cnts", comdat($__profv_foo_inline), align 8
+; ELF: @__profd_foo_inline = linkonce_odr hidden global{{.*}}, section "__llvm_prf_data", comdat($__profv_foo_inline), align 8
+; COFF: @__profc_foo_inline = internal global{{.*}}, section ".lprfc$M", comdat($foo_inline), align 8
+; COFF: @__profd_foo_inline = internal global{{.*}}, section ".lprfd$M", comdat($foo_inline), align 8
+define weak_odr void @foo_inline() comdat {
+  call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_inline, i32 0, i32 0), i64 0, i32 1, i32 0)
+  ret void
+}
+
+$foo_extern = comdat any
+
+@__profn_foo_extern = linkonce_odr hidden constant [10 x i8] c"foo_extern"
+
+; ELF: @__profc_foo_extern = linkonce_odr hidden global{{.*}}, section "__llvm_prf_cnts", comdat($__profv_foo_extern)
+; ELF: @__profd_foo_extern = linkonce_odr hidden global{{.*}}, section "__llvm_prf_data", comdat($__profv_foo_extern)
+; COFF: @__profc_foo_extern = linkonce_odr dso_local global{{.*}}, section ".lprfc$M", comdat, align 8
+; COFF: @__profd_foo_extern = internal global{{.*}}, section ".lprfd$M", comdat($__profc_foo_extern), align 8
+define available_externally void @foo_extern() {
+  call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_extern, i32 0, i32 0), i64 0, i32 1, i32 0)
+  ret void
+}
diff --git a/test/Instrumentation/InstrProfiling/linkage.ll b/test/Instrumentation/InstrProfiling/linkage.ll
index 9753757..29ae5d6 100644
--- a/test/Instrumentation/InstrProfiling/linkage.ll
+++ b/test/Instrumentation/InstrProfiling/linkage.ll
@@ -1,11 +1,11 @@
 ;; Check that runtime symbols get appropriate linkage.
 
-; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -instrprof -S | FileCheck %s --check-prefixes=COMMON,MACHO
-; RUN: opt < %s -mtriple=x86_64-unknown-linux -instrprof -S | FileCheck %s --check-prefixes=COMMON,LINUX
-; RUN: opt < %s  -mtriple=x86_64-pc-win32-coff -instrprof -S | FileCheck %s --check-prefixes=COMMON,COFF
-; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -passes=instrprof -S | FileCheck %s --check-prefixes=COMMON,MACHO
-; RUN: opt < %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=COMMON,LINUX
-; RUN: opt < %s  -mtriple=x86_64-pc-win32-coff -passes=instrprof -S | FileCheck %s --check-prefixes=COMMON,COFF
+; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -instrprof -S | FileCheck %s --check-prefixes=POSIX,MACHO
+; RUN: opt < %s -mtriple=x86_64-unknown-linux -instrprof -S | FileCheck %s --check-prefixes=POSIX,LINUX
+; RUN: opt < %s  -mtriple=x86_64-pc-win32-coff -instrprof -S | FileCheck %s --check-prefixes=COFF
+; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -passes=instrprof -S | FileCheck %s --check-prefixes=POSIX,MACHO
+; RUN: opt < %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=POSIX,LINUX
+; RUN: opt < %s  -mtriple=x86_64-pc-win32-coff -passes=instrprof -S | FileCheck %s --check-prefixes=COFF
 
 ; MACHO: @__llvm_profile_runtime = external global i32
 ; LINUX-NOT: @__llvm_profile_runtime = external global i32
@@ -16,31 +16,38 @@
 @__profn_foo_inline = linkonce_odr hidden constant [10 x i8] c"foo_inline"
 @__profn_foo_extern = linkonce_odr hidden constant [10 x i8] c"foo_extern"
 
-; COMMON: @__profc_foo = hidden global
-; COMMON: @__profd_foo = hidden global
+; POSIX: @__profc_foo = hidden global
+; POSIX: @__profd_foo = hidden global
+; COFF: @__profc_foo = internal global
+; COFF-NOT: comdat
+; COFF: @__profd_foo = internal global
 define void @foo() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
 }
 
-; COMMON: @__profc_foo_weak = weak hidden global
-; COMMON: @__profd_foo_weak = weak hidden global
+; POSIX: @__profc_foo_weak = weak hidden global
+; POSIX: @__profd_foo_weak = weak hidden global
+; COFF: @__profc_foo_weak = internal global
+; COFF: @__profd_foo_weak = internal global
 define weak void @foo_weak() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @__profn_foo_weak, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
 }
 
-; COMMON: @"__profc_linkage.ll:foo_internal" = internal global
-; COMMON: @"__profd_linkage.ll:foo_internal" = internal global
+; POSIX: @"__profc_linkage.ll:foo_internal" = internal global
+; POSIX: @"__profd_linkage.ll:foo_internal" = internal global
+; COFF: @"__profc_linkage.ll:foo_internal" = internal global
+; COFF: @"__profd_linkage.ll:foo_internal" = internal global
 define internal void @foo_internal() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @"__profn_linkage.ll:foo_internal", i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
 }
 
-; COMMON: @__profc_foo_inline = linkonce_odr hidden global
-; COFF-SAME: section ".lprfc", align 8
-; COMMON: @__profd_foo_inline = linkonce_odr hidden global
-; COFF-SAME: section ".lprfd", align 8
+; POSIX: @__profc_foo_inline = linkonce_odr hidden global
+; POSIX: @__profd_foo_inline = linkonce_odr hidden global
+; COFF: @__profc_foo_inline = internal global{{.*}} section ".lprfc$M", align 8
+; COFF: @__profd_foo_inline = internal global{{.*}} section ".lprfd$M", align 8
 define linkonce_odr void @foo_inline() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_inline, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
@@ -50,8 +57,8 @@
 ; LINUX: @__profd_foo_extern = linkonce_odr hidden global {{.*}}section "__llvm_prf_data", comdat($__profv_foo_extern), align 8
 ; MACHO: @__profc_foo_extern = linkonce_odr hidden global
 ; MACHO: @__profd_foo_extern = linkonce_odr hidden global
-; COFF: @__profc_foo_extern = linkonce_odr hidden global {{.*}}section ".lprfc", comdat, align 8
-; COFF: @__profd_foo_extern = linkonce_odr hidden global {{.*}}section ".lprfd", comdat($__profc_foo_extern), align 8
+; COFF: @__profc_foo_extern = linkonce_odr dso_local global {{.*}}section ".lprfc$M", comdat, align 8
+; COFF: @__profd_foo_extern = internal global {{.*}}section ".lprfd$M", comdat($__profc_foo_extern), align 8
 define available_externally void @foo_extern() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @__profn_foo_extern, i32 0, i32 0), i64 0, i32 1, i32 0)
   ret void
diff --git a/test/Instrumentation/InstrProfiling/platform.ll b/test/Instrumentation/InstrProfiling/platform.ll
index dbdde08..4c54aea 100644
--- a/test/Instrumentation/InstrProfiling/platform.ll
+++ b/test/Instrumentation/InstrProfiling/platform.ll
@@ -20,13 +20,14 @@
 
 ; MACHO: @__profc_foo = hidden global [1 x i64] zeroinitializer, section "__DATA,__llvm_prf_cnts", align 8
 ; ELF: @__profc_foo = hidden global [1 x i64] zeroinitializer, section "__llvm_prf_cnts", align 8
-; WINDOWS: @__profc_foo = hidden global [1 x i64] zeroinitializer, section ".lprfc", align 8
+; WINDOWS: @__profc_foo = internal global [1 x i64] zeroinitializer, section ".lprfc$M", align 8
 
 ; MACHO: @__profd_foo = hidden {{.*}}, section "__DATA,__llvm_prf_data,regular,live_support", align 8
 ; ELF: @__profd_foo = hidden {{.*}}, section "__llvm_prf_data", align 8
-; WINDOWS: @__profd_foo = hidden {{.*}}, section ".lprfd", align 8
+; WINDOWS: @__profd_foo = internal global {{.*}}, section ".lprfd$M", align 8
 
-; ELF: @__llvm_prf_nm = private constant [{{.*}} x i8] c"{{.*}}", section "{{.*}}__llvm_prf_names"
+; ELF: @__llvm_prf_nm = private constant [{{.*}} x i8] c"{{.*}}", section "{{.*}}__llvm_prf_names", align 1
+; WINDOWS: @__llvm_prf_nm = private constant [{{.*}} x i8] c"{{.*}}", section "{{.*}}lprfn$M", align 1
 
 define void @foo() {
   call void @llvm.instrprof.increment(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @__profn_foo, i32 0, i32 0), i64 0, i32 1, i32 0)
@@ -42,14 +43,11 @@
 ; LINUX-NOT: define internal void @__llvm_profile_register_functions
 ; FREEBSD-NOT: define internal void @__llvm_profile_register_functions
 ; PS4-NOT: define internal void @__llvm_profile_register_functions
+; WINDOWS-NOT: define internal void @__llvm_profile_register_functions
 
 ;; PR38340: When dynamic registration is used, we had a bug where we'd register
 ;; something that's not a __profd_* variable.
 
-; WINDOWS: define internal void @__llvm_profile_register_functions()
-; WINDOWS-NOT: __llvm_profile_runtime_user
-; WINDOWS: ret void
-
 ; SOLARIS: define internal void @__llvm_profile_register_functions
 ; SOLARIS-NOT: __llvm_profile_runtime_user
 ; SOLARIS: ret void
@@ -58,5 +56,5 @@
 ; LINUX-NOT: define internal void @__llvm_profile_init
 ; FREEBSD-NOT: define internal void @__llvm_profile_init
 ; PS4-NOT: define internal void @__llvm_profile_init
+; WINDOWS-NOT: define internal void @__llvm_profile_init
 ; SOLARIS: define internal void @__llvm_profile_init
-; WINDOWS: define internal void @__llvm_profile_init