[llvm] VNCoercion: Safely handle targets where pointers are larger than the largest legal integers. (PR #118584)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

We know we have issues with GVN not honouring pointer provenance in ways that matter once that provenance is captured in hardware, whether via CHERI or some other provenance-tracking scheme that doesn't expose the provenance as bits in the address you can mess with. There's no sense upstreaming random historical cruft that we know is not sufficient, and may not be necessary.

https://github.com/llvm/llvm-project/pull/118584