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

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic commented:

Please update LangRef with the new overload and verifier rule.

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