[llvm] [EarlyCSE] Compare GEP instructions based on offset (PR #65875)

[via llvm-commits]

DianQK wrote:

It's not ready for review yet. It may contain many nits.

Progress update:
Since lookups require frequent computation of constant offsets. GEP should not be considered as a `SimpleValue`.
I got better results than the last commit. I'll analyze it next with specific source code.

https://llvm-compile-time-tracker.com/compare.php?from=ac1daad9bb4eb083df6b215c029816d3149e00d8&to=31e2ec9d89aeded9ea5da822262449b0c4e8ab16&stat=instructions:u

https://github.com/llvm/llvm-project/pull/65875