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

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alex-t wrote:

Thanks for the feedback and pieces of advice.
The code here is far outdated.
I am currently fixing some correctness issues.
I will update the PR as soon as they are fixed.

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