[llvm] Revert "[SimplifyCFG] Fix branch-weight overflow when folding switch case into default" (PR #212540)

[Mircea Trofin via llvm-commits]

mtrofin wrote:

> Reverts #212520
> 
> This broke the profcheck builder, which given this is a profile info fix probably should not be happening.

can you link the failure? this is indeed odd. 

https://github.com/llvm/llvm-project/pull/212540