[clang] [llvm] [CFI] Don't create alias->alias chains. (PR #225951)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

After some thinking there are issues with interposable aliases in that AI suggestion
probably 1cd334db7010e86927963ee53a8bdbf18488acab is good enough improvement as-is

https://github.com/llvm/llvm-project/pull/225951