[llvm] [BasicBlockSections] Apply path cloning with -basic-block-sections. (PR #68860)

[via llvm-commits]

spupyrev wrote:

@rlavaee could you please point to the code where these cloned paths are being implemented? There is likely a non-trivial tradeoff between eliminating branches/jumps and increasing the code size. I'm curious to see the algorithm

https://github.com/llvm/llvm-project/pull/68860