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

[Alexander Richardson via llvm-commits]

arichardson wrote:

Would be good to get a review from e.g. amdgpu folks since the non-zero globals AS would result in a functional change (assuming this intrinsic is supported there).

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