[llvm] [LoopUtils] Simplify expanded RT-checks (PR #157518)

[Florian Hahn via llvm-commits]

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

LGTM, should be good to go now that the changed has been re-landed as 9b1b93766dfa34ee94859d91a5fcfef853b95265

https://github.com/llvm/llvm-project/pull/157518