[llvm] [Analysis] Use CycleInfo for BranchProbabilityInfo (PR #210301)

[Jay Foad via llvm-commits]

https://github.com/jayfoad commented:

Seems very nice overall but I don't feel qualified to review the changes to BranchProbabilityInfo itself so I will defer to other reviewers.

https://github.com/llvm/llvm-project/pull/210301