[llvm] [AMDGPU] Change control flow intrinsic lowering making the wave to re… (PR #86805)

[via llvm-commits]

alex-t wrote:

This is going to be closed as there were too many changes done.
the new one is: https://github.com/llvm/llvm-project/pull/92809

https://github.com/llvm/llvm-project/pull/86805