[llvm] [SimplifyCFG] Propagate profile in `simplifySwitchOfPowersOfTwo` (PR #165804)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

I'm tempted to land this to make the profcheck bot green, and continue review on the calculation afterwards. Hope folks are OK with this.

https://github.com/llvm/llvm-project/pull/165804