[clang] [clang][FMV] Do not omit explicit default target_version attribute. (PR #96628)

[Tomas Matheson via cfe-commits]

================
@@ -11498,11 +11502,9 @@ static void patchDefaultTargetVersion(FunctionDecl *From, FunctionDecl *To) {
 
   if (MVKindTo == MultiVersionKind::None &&
       (MVKindFrom == MultiVersionKind::TargetVersion ||
-       MVKindFrom == MultiVersionKind::TargetClones)) {
-    To->setIsMultiVersion();
+       MVKindFrom == MultiVersionKind::TargetClones))
     To->addAttr(TargetVersionAttr::CreateImplicit(
         To->getASTContext(), "default", To->getSourceRange()));
-  }
 }
 
 static bool CheckTargetCausesMultiVersioning(Sema &S, FunctionDecl *OldFD,
----------------
tmatheson-arm wrote:

```suggestion
static bool CheckAttributeCausesMultiVersioning(Sema &S, FunctionDecl *OldFD,
```

https://github.com/llvm/llvm-project/pull/96628