[llvm] [InstCombine] Try to fold add into GEP x, C (PR #85090)

[David Green via llvm-commits]

davemgreen wrote:

> bringing the final codegen closer to what it will later be

Unfortunately it looks like this might not be exactly true, and canonicalizing the geps (at least in the way I have tried it) does not produce the same final output I was hoping for, I think partly because of multiple uses.

https://github.com/llvm/llvm-project/pull/85090