[llvm] [IR] Introduce `llvm.errno.tbaa` metadata for errno alias disambiguation (PR #160458)

[Antonio Frighetto via llvm-commits]

antoniofrighetto wrote:

Looks like UBSan triggered an UB here (https://lab.llvm.org/buildbot/#/builders/169/builds/15232), might need to rework the other TBAAVerifier function signatures too to accept a nullable instruction.

https://github.com/llvm/llvm-project/pull/160458