[llvm] [InstCombine] Fold comparisons of llvm.usub.sat result with its LHS (PR #214108)

[Haram Jeong via llvm-commits]

haramj wrote:

@andjo403 Thanks for the review! I updated the fold to handle ICMP_NE and ICMP_UGT, generalized the RHS check using isKnownNonZero(), simplified the matcher, renamed the tests to include usub_sat, applied clang-format, and split the changes into a pre-commit test commit followed by the implementation commit.

https://github.com/llvm/llvm-project/pull/214108