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

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SahilPatidar wrote:

@arsenm,
The issue might be with the system-installed opt binary. Is there a way to include the opt binary from the build?

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