[llvm] [clang] [clang-tools-extra] [SimplifyCFG] Prevent merging cbranch to cbranch if the branch probability from the first to second is too low. (PR #69375)

[Valery Pykhtin via cfe-commits]

vpykhtin wrote:

Guys, I really need this change submitted, I'm going to submit it on monday if there're no objections.

https://github.com/llvm/llvm-project/pull/69375