[SPIR-V] Use MapVector for per function maps (#239349)

Iterating a DenseMap keyed by Function pointers made the order of
FPFastMathDefault execution modes and their constants may vary between
runs with SPV_KHR_float_controls2

llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp

diff --git a/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp b/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
index 836d60b..a0b0bca 100644
--- a/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
@@ -19,6 +19,7 @@
 #include "SPIRVUtils.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringSwitch.h"
@@ -197,7 +198,7 @@
   SmallPtrSet<Value *, 0> Named;
 
   // map of function declarations to <pointer arg index => element type>
-  DenseMap<Function *, SmallVector<std::pair<unsigned, Type *>>> FDeclPtrTys;
+  MapVector<Function *, SmallVector<std::pair<unsigned, Type *>>> FDeclPtrTys;
 
   // a register of Instructions that don't have a complete type definition
   bool CanTodoType = true;
@@ -3189,7 +3190,7 @@
 
 static SPIRV::FPFastMathDefaultInfoVector &getOrCreateFPFastMathDefaultInfoVec(
     const Module &M,
-    DenseMap<Function *, SPIRV::FPFastMathDefaultInfoVector>
+    MapVector<Function *, SPIRV::FPFastMathDefaultInfoVector>
         &FPFastMathDefaultInfoMap,
     Function *F) {
   auto it = FPFastMathDefaultInfoMap.find(F);
@@ -3263,7 +3264,7 @@
   // type. The first element is the smallest bit width, and the last element
   // is the largest bit width, therefore, we will have {half, float, double}
   // in the order of their bit widths.
-  DenseMap<Function *, SPIRV::FPFastMathDefaultInfoVector>
+  MapVector<Function *, SPIRV::FPFastMathDefaultInfoVector>
       FPFastMathDefaultInfoMap;
 
   for (unsigned i = 0; i < Node->getNumOperands(); i++) {

llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h

diff --git a/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h b/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h
index 8fd9052..a9150e0 100644
--- a/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h
+++ b/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h
@@ -18,6 +18,7 @@
 #include "SPIRVGlobalRegistry.h"
 #include "SPIRVUtils.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/IR/PassManager.h"
@@ -131,7 +132,7 @@
 using RegisterAliasMapTy =
     std::map<const MachineFunction *, LocalToGlobalRegTable>;
 using FPFastMathDefaultInfoMapTy =
-    DenseMap<const Function *, FPFastMathDefaultInfoVector>;
+    MapVector<const Function *, FPFastMathDefaultInfoVector>;
 
 // The struct contains results of the module analysis and methods
 // to access them.