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

[via llvm-commits]

goldsteinn 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.
> > 
> > 
> > stage2 is using the bootstrapped clang with this commit?
> 
> Yes.
> 
> > Is the `clang build:instruction:u` the change in instructions for stage1 to build stage2? If so seems like there is also a .3% regression there?
> 
> Right. This is likely correlated with the code size increase.

You would expect the same logic to apply to the rest of stage2 CTMark no?

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