[llvm] [CodeLayout] Do not flip branch condition when using optsize (PR #114607)

[Matthias Braun via llvm-commits]

MatzeB wrote:

Actually would it make sense to have a flag/mode (during profile loading or similar) that preprocess the profile and removes all branch probability from cold blocks when optimizing for size? That would be nice in that it affects other optimizations as well and the logic would be decoupled from `MachineBlockPlacement`...

https://github.com/llvm/llvm-project/pull/114607