[llvm] [TargetLowering] Fold (a | b) ==/!= b -> (a & ~b) ==/!= 0 when and-not exists (PR #145368)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> I think you meant to merge not rebase @RKSimon

@AZero13 Don't worry, I meant to merge - I've started doing this to ensure that a patch still builds cleanly with CI before pushing shortly afterward. 

https://github.com/llvm/llvm-project/pull/145368