[llvm] [InstCombine] Fold comparison of adding two z/sext booleans (PR #67895)

[Nikita Popov via llvm-commits]

nikic wrote:

@dtcxzyw I don't see how the lookup-table based implementation improves this code. It makes it impossible to understand or verify the logic behind the transform.

https://github.com/llvm/llvm-project/pull/67895