[llvm] Update amdgpu_gfx functions to use s0-s3 for inreg SGPR arguments on targets using scratch instructions for stack (PR #78553)

[Rajveer Singh Bharadwaj via llvm-commits]

Rajveer100 wrote:

@philnik777 @ldionne 
Is it normal to see 175+ tests failing here, or is there any flag to bless tests (like `--bless`) to produce the necessary changes. 

https://github.com/llvm/llvm-project/pull/78553