[llvm] [SimplifyCFG] Fold the contiguous wrapping cases into ICmp. (PR #161000)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw approved this pull request.

LGTM. TBH the cases are unnecessary to be contiguous. There can be holes between them (unreachable cases).

https://github.com/llvm/llvm-project/pull/161000