[clang] [llvm] [mlir] [clang][CodeGen][AA] Add `!llvm.errno.tbaa` gathering int-compatible TBAA nodes (PR #125258)

[Antonio Frighetto via llvm-commits]

antoniofrighetto wrote:

@nikic Mind glancing over the draft quickly? !llvm.errno.tbaa is being attached to individual load/store accessing errno, although I just realized that this information is already embedded in TBAA, so IIUC !llvm.errno.tbaa should just be a module-level list of int-compatible TBAA nodes. Is my latest understanding correct? That would make it much simpler than I thought. Sorry if I’m missing something!

https://github.com/llvm/llvm-project/pull/125258