[clang] [clang][fmv] Drop .ifunc from target_version's entrypoint's mangling (PR #81194)

[Jon Roelofs via cfe-commits]

================
@@ -4393,7 +4394,7 @@ llvm::Constant 
*CodeGenModule::GetOrCreateMultiVersionResolver(GlobalDecl GD) {
   // a separate resolver).
   std::string ResolverName = MangledName;
   if (getTarget().supportsIFunc()) {
-    if (!FD->isTargetClonesMultiVersion())
+    if (!FD->isTargetClonesMultiVersion() && 
!FD->isTargetVersionMultiVersion())
----------------
jroelofs wrote:

`target` and the two cpu-specific ones. I'll change it to a switch.

https://github.com/llvm/llvm-project/pull/81194
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