ThinLTO: Fix promotion aliases with -msvc targets

[samitolvanen]

Summary

Use quotes around function names in module inline assembly to
fix promotion aliases with x86_64-pc-windows-msvc.

[samitolvanen]

Nick suggested reverting until we figure out if this is the ideal fix here. I'll fold this to the original patch.

llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp

for (auto &ExportGV : ExportM.global_values()) {
     if (ImportGV) {
       ImportGV->setName(NewName);
       ImportGV->setVisibility(GlobalValue::HiddenVisibility);
     }
 
     if (isa<Function>(&ExportGV)) {
       // Create a local alias with the original name to avoid breaking
       // references from inline assembly.
-      std::string Alias = ".set " + OldName + "," + NewName + "\n";
+      std::string Alias = ".set \"" + OldName + "\",\"" + NewName + "\"\n";
       ExportM.appendModuleInlineAsm(Alias);
     }
   }
 
   if (!RenamedComdats.empty())
     for (auto &GO : ExportM.global_objects())
       if (auto *C = GO.getComdat()) {
         auto Replacement = RenamedComdats.find(C);

llvm/test/Transforms/ThinLTOBitcodeWriter/cfi-icall-static-inline-asm.ll

 ; REQUIRES: x86-registered-target
 ; RUN: opt -thinlto-bc -thinlto-split-lto-unit -o - %s | llvm-modextract -b -n 0 -o - | llvm-dis | FileCheck %s
 
 target triple = "x86_64-unknown-linux-gnu"
 
-; CHECK: module asm ".set a,a.[[HASH:[0-9a-f]+]]"
+; CHECK: module asm ".set \22a\22,\22a.[[HASH:[0-9a-f]+]]\22"
 
 define void @b() {
   %f = alloca void ()*, align 8
   ; CHECK: store{{.*}} @a.[[HASH]],{{.*}} %f
   store void ()* @a, void ()** %f, align 8
   ; CHECK: %1 = call void ()* asm sideeffect "leaq a(%rip)
   %1 = call void ()* asm sideeffect "leaq a(%rip), $0\0A\09", "=r,~{dirflag},~{fpsr},~{flags}"()
   ret void
 }
 
 ; CHECK: define{{.*}} @a.[[HASH]](){{.*}} !type
 define internal void @a() !type !0 {
   ret void
 }
 
 !0 = !{i64 0, !"typeid1"}