[llvm] [InstCombine] fold `gepi _, (srem x, y)` to `gepi _, (urem x, y)` if `y` is power-of-2 (PR #180148)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw approved this pull request.

Looks like we can always convert `srem x, pow2` to urem if we can prove the result is non-negative: https://alive2.llvm.org/ce/z/JfcRWE There's nothing special about gep.


https://github.com/llvm/llvm-project/pull/180148