[llvm] [IR] Handle `.__uniq.` in `getGlobalIndentifier` for local linkage objects (PR #98163)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

Abandoning this - this leaves unsolved the case where externs are internalized post-link. I have an alternative proposal which addresses that and also sets us up to do away with the various name -> GUID gymnastics we do in InstrProf and elsewhere. Will send a RFC shortly, want to make sure "it holds".

https://github.com/llvm/llvm-project/pull/98163