[llvm] [SCEV] Introduce IncrementNSUW, replacing NSSW (PR #219559)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

TBH I don't really get this change. NUUW, NUSW, NSSW are all reasonable wrapping behaviors, but I have a hard time understanding how NSUW would be useful (except for the case where it happens to be equivalent to neither NUUW or NSSW).

https://github.com/llvm/llvm-project/pull/219559