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

[John McCall via cfe-commits]

rjmccall wrote:

Sorry, can you back up and explain the root problem you're trying to solve? You have a platform where we're emitting accesses to `errno` as if it weren't an `int`? What does it look like in source?

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