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

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

I'm mostly concerned about the case where the lowered node has the wrong type.  For example, AArch64TargetLowering::LowerINTRINSIC_WO_CHAIN always creates a value with the pointer width of addrspace 0, but address spaces exist which don't have the native pointer width (arm64_32 exists, __ptr32 exists).  And I suspect that inconsistency causes a crash.  Even if it doesn't actually end up crashing in some cases, I'd prefer an explicit check to be on the safe side.

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