[llvm] [Attributor] Don't follow pointer-to-integer casts in AAPointerInfo (PR #225290)

[Shilei Tian via llvm-commits]

https://github.com/shiltian approved this pull request.

LGTM. `PtrToAddrInst` is a new thing after these AA work. It is very likely that other places that only check PtrToIntInst would need similar fix.

https://github.com/llvm/llvm-project/pull/225290