[llvm] [LoopUnroll] Rotate loop to make it countable for runtime unrolling (PR #146540)

[Marek Sedláček via llvm-commits]

mark-sed wrote:

I have submitted PR with the alternative approach of rotation inside of `UnrollRuntimeLoopRemainder` (as discussed above).
It can be found here: https://github.com/llvm/llvm-project/pull/148243

https://github.com/llvm/llvm-project/pull/146540