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

[Matthias Braun via llvm-commits]

MatzeB wrote:

Interesting, by this logic a simpler thing to do would probably be to ignore the whole `MachineBranchProbabilityInfo` within the `MachineBlockPlacement` pass (and you can probably make the same argument for various other passes as well that profiles work against consistency in code generation).

But I suspect this change is geared towards hit functions with just some cold basic blocks...

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