[llvm] [AMDGPU] Allocate i1 argument to SGPRs (PR #72461)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Thanks @arsenm What about SILowerI1Copies?

There should be no changes there. It cannot possibly have the context necessary to do anything sensible. The code there is nonsense as it is 

https://github.com/llvm/llvm-project/pull/72461