[llvm] [InstCombine] Don't require GEP in indexed compare fold (PR #81614)

[Nikita Popov via llvm-commits]

nikic wrote:

Huh, this seems to have a larger impact than I expected: http://llvm-compile-time-tracker.com/compare.php?from=f0db35b93f31ea5d6ff9bd4791fb6755b5a5bb9b&to=c77f948ef66114ea99f0daf5a72d3646bb5845ff&stat=instructions%3Au

clang stage2 becomes 0.6% larger and 0.5% faster as a result of this change.

https://github.com/llvm/llvm-project/pull/81614