[clang] [AArch64][FMV] Enable PAuth and BTI hardening of resolver functions (PR #141573)

[Eli Friedman via cfe-commits]

================
@@ -4652,6 +4659,7 @@ llvm::Constant 
*CodeGenModule::GetOrCreateMultiVersionResolver(GlobalDecl GD) {
                                   "", Resolver, &getModule());
     GIF->setName(ResolverName);
     SetCommonAttributes(FD, GIF);
+    SetResolverAttrs(cast<llvm::Function>(Resolver));
----------------
efriedma-quic wrote:

Is Resolver actually guaranteed to be a function?  GetOrCreateLLVMFunction can 
return other kinds of GlobalValues in some cases.

Should we be calling SetCommonAttributes/setGVProperties to set the 
linkage/visibility of the resolver?

https://github.com/llvm/llvm-project/pull/141573
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