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

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

Can you elaborate more in the high level description about what this does and how this solves the underlying issue? Does it simply move towards only using exec modifications glued to the terminator? 

Do we still need to place more temporary blocks for exec manipulations in some cases?

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