[llvm] [GlobalOpt] Look through non-PointerType constant expressions. (PR #125205)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

The GEP version is UB due to provenance.

But yes, we probably want need to restrict more optimizations on comparison operators.

https://github.com/llvm/llvm-project/pull/125205