[llvm] Update amdgpu_gfx functions to use s0-s3 for inreg SGPR arguments on targets using scratch instructions for stack #78226 (PR #81394)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> > And another crash is in this file: llvm/test/CodeGen/AMDGPU/amdgpu-simplify-libcall-pow-codegen.ll.
> 
> I don't see how you could have run into this with this patch. It's not even running codegen

> /Users/sahilpatidar/Desktop/llvm-project-17.0.3.src

Are you running something else in a release? 

https://github.com/llvm/llvm-project/pull/81394