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

[Ed Maste via cfe-commits]

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+// RUN: %clang_cc1 -triple %itanium_abi_triple -Wunused -x c -verify %s
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emaste wrote:

Git does not track file moves explicitly. You'll find that `git log --follow` will work equally well whether you use `git add` and `git rm` or `git mv`. It uses a heuristic to decide that when a file disappears and a similar file appears it was probably moved. 

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