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

[Mircea Trofin via llvm-commits]

mtrofin wrote:

> It might be worthwhile to create a simple NFC PR that simply creates a global `NameParticles` struct and removes the string constants like `".llvm."`. This has a nice benefit of making these searchable in the codebase.

I agree, I should be able to split that off this quickly

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