[clang] [llvm] [clang][IR] Overload @llvm.thread.pointer to support non-AS0 targets (PR #132489)

[Alexander Richardson via llvm-commits]

https://github.com/arichardson approved this pull request.

'Thraed' typo in the commit message but otherwise LGTM. But someone else should also approve this.

https://github.com/llvm/llvm-project/pull/132489