[llvm] [profcheck] Add unknown branch weights to expanded cmpxchg loop. (PR #165841)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> Because not all 45 failed tests are fixed in this single PR. I will update them after all PR merged.

Can you not add the ones that do get fixed?

https://github.com/llvm/llvm-project/pull/165841