[clang] [Sema] Mark alias/ifunc targets used and consider mangled names (PR #87130)

[Fangrui Song via cfe-commits]

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@@ -1980,6 +1981,23 @@ static void handleWeakRefAttr(Sema &S, Decl *D, const 
ParsedAttr &AL) {
   D->addAttr(::new (S.Context) WeakRefAttr(S.Context, AL));
 }
 
+// Mark alias/ifunc target as used. For C++, we look up the demangled name
----------------
MaskRay wrote:

Thanks for mentioning `overloadable`. Added a test and fixed the comment.

https://github.com/llvm/llvm-project/pull/87130
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