[clang][AArch64][FMV] Stop emitting alias to ifunc. (#96221)

Long story short the interaction of two optimizations happening in
GlobalOpt results in a crash. For more details look at the issue
https://github.com/llvm/llvm-project/issues/96197. I will be fixing this
in GlobalOpt but it is a conservative solution since it won't allow us
to optimize resolvers which return a pointer to a function whose
definition is in another TU when compiling without LTO:

```
__attribute__((target_version("simd"))) void bar(void);
__attribute__((target_version("default"))) void bar(void);
int foo() { bar(); }
```

fixes: #96197

1 files changed, 2 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index dd4a665..7653447 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -4259,8 +4259,8 @@ void CodeGenModule::emitMultiVersionFunctions() {
     llvm::Constant *ResolverConstant = GetOrCreateMultiVersionResolver(GD);
     if (auto *IFunc = dyn_cast<llvm::GlobalIFunc>(ResolverConstant)) {
       ResolverConstant = IFunc->getResolver();
-      if (FD->isTargetClonesMultiVersion() ||
-          FD->isTargetVersionMultiVersion()) {
+      if (FD->isTargetClonesMultiVersion() &&
+          !getTarget().getTriple().isAArch64()) {
         std::string MangledName = getMangledNameImpl(
             *this, GD, FD, /*OmitMultiVersionMangling=*/true);
         if (!GetGlobalValue(MangledName + ".ifunc")) {