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

[Alexandros Lamprineas via cfe-commits]

================
@@ -11576,22 +11584,6 @@ static bool CheckTargetCausesMultiVersioning(Sema &S, FunctionDecl *OldFD,
     }
   }
 
-  if (NewTVA) {
----------------
labrinea wrote:

The assertion should be conditional when NewTVA is not null because the function is used for the target attribute as well. Do we still want the assertion?

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