[llvm] [polly] [SimpleLoopUnswitch] Reland "Generalize the notion of trivial unswitching" (PR #204934)

[Ehsan Amiri via llvm-commits]

amehsan wrote:

> @amehsan I have submitted a fix that should resolve the problem and added you as reviewer.

Thanks

https://github.com/llvm/llvm-project/pull/204934