[gn build] Port f9cd2ee119ff

diff --git a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
index 499ded9..022cd87 100644
--- a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn

@@ -301,6 +301,7 @@
     "LLVM_BUILD_SHARED_LIBS=",
     "LLVM_ENABLE_LLVM_C_EXPORT_ANNOTATIONS=",
     "LLVM_ENABLE_TELEMETRY=",
+    "LLVM_ENABLE_ONDISK_CAS=",
     "LLVM_DEFAULT_TARGET_TRIPLE=$llvm_target_triple",
     "LLVM_ENABLE_DEBUGLOC_TRACKING_COVERAGE=",
     "LLVM_ENABLE_DEBUGLOC_TRACKING_ORIGIN=",

diff --git a/llvm/utils/gn/secondary/llvm/lib/CAS/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/CAS/BUILD.gn
index 8b67ac3..2f692d7 100644
--- a/llvm/utils/gn/secondary/llvm/lib/CAS/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/CAS/BUILD.gn

@@ -5,6 +5,8 @@
     "ActionCaches.cpp",
     "BuiltinCAS.cpp",
     "InMemoryCAS.cpp",
+    "MappedFileRegionArena.cpp",
     "ObjectStore.cpp",
+    "OnDiskCommon.cpp",
   ]
 }

diff --git a/llvm/utils/gn/secondary/llvm/unittests/CAS/BUILD.gn b/llvm/utils/gn/secondary/llvm/unittests/CAS/BUILD.gn
index efd4f19..de6de0b 100644
--- a/llvm/utils/gn/secondary/llvm/unittests/CAS/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/unittests/CAS/BUILD.gn

@@ -10,5 +10,6 @@
     "ActionCacheTest.cpp",
     "CASTestConfig.cpp",
     "ObjectStoreTest.cpp",
+    "ProgramTest.cpp",
   ]
 }