[llvm] AMDGPU/SILowerI1Copies process phi incomings in specific order (PR #72124)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Just a quick question what should I do if I want to merge two separate patches, open two PRs?

Yes. There's 3rd party tooling to help with this but I'm not sure there's a consensus on the best way to deal with this yet 

https://github.com/llvm/llvm-project/pull/72124