[llvm] [LoopUnroll] Rotate loop before unrolling inside of UnrollRuntimeLoopRemainder (PR #148243)

[Marek Sedláček via llvm-commits]

mark-sed wrote:

I will be closing this PR as this does not seem like the right way to go. We also found downstream that changing the order of the `ExitInfo` computation to after runtime unrolling is done, has an unintended side effect.
I have proposed a new profitability check in loop rotation from which runtime unrolling can now also benefit - https://github.com/llvm/llvm-project/pull/162654.

https://github.com/llvm/llvm-project/pull/148243