[llvm] [InstCombine] Prefer to keep power-of-2 constants when combining ashr exact and slt/ult of a constant (PR #86111)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> However, I don't see any performance improvement/regression according to the IR diff/instruction count.

I will re-test this patch later as I noticed llvm-diff doesn't handle flags/attrs :(


https://github.com/llvm/llvm-project/pull/86111