[llvm] [llvm][loop-rotate] Allow forcing loop-rotation (PR #82828)

[Petr Hosek via llvm-commits]

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

LGTM but you might also want to wait for @fhahn and @hiraditya to take a look.

https://github.com/llvm/llvm-project/pull/82828