[llvm] [InstCombine] Fold `(x < y) ? -1 : zext(x != y)` into `u/scmp(x,y)` (PR #101049)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> If these are starting to generate llvm.scmp/ucmp, do they need to be careful with vectorization if that is not yet supported for cmp intrinsics?

cc @RKSimon @alexey-bataev @fhahn 


https://github.com/llvm/llvm-project/pull/101049