[llvm] [AA] Refine ModRefInfo taking into account `errnomem` location (PR #157495)

[Nikita Popov via llvm-commits]

nikic wrote:

We should probably actually remove that implicit conversion at some point -- I filed https://github.com/llvm/llvm-project/issues/159290 to track.

https://github.com/llvm/llvm-project/pull/157495