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

[Nick Desaulniers via cfe-commits]

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@@ -0,0 +1,47 @@
+// RUN: %clang_cc1 -triple %itanium_abi_triple -Wunused -x c -verify %s
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nickdesaulniers wrote:

consider using `git mv` when you rename files or move test cases. Makes it very obvious in code review when existing test cases are deleted vs moved and or updated.

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