[llvm] [InstCombine] Canonicalize (a + 1 == 0) ? -1 : a + 1 -> uadd.sat(a, 1) (PR #144566)

[via llvm-commits]

AZero13 wrote:

@topperc yeah this is going to require a lot of fixes. Can I just go back to what I did at the start because this change is otherwise gonna affect 50 test files, many of which regressed and should be addressed in another PR.

https://github.com/llvm/llvm-project/pull/144566