[llvm] [LoopUnroll] Use branch probability in multi-exit loop unrolling (PR #164799)

[Joel E. Denny via llvm-commits]

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jdenny-ornl wrote:

I didn't find an explanation, but existing tests have done this too: https://reviews.llvm.org/D98098

https://github.com/llvm/llvm-project/pull/164799