[llvm] [LoopRotate] Fix branch weights for rotated multi-exit loops (PR #202219)

[Fabrice de Gans via llvm-commits]

Steelskin wrote:

Sorry I am not familiar enough with this part of the code base to give you a review. I think I showed up because I did some mechanical changes to the headers. Going by some of the files history, @fhahn or @aykevl might be a better fit.


https://github.com/llvm/llvm-project/pull/202219