[llvm] [AMDGPU] Make AMDGPULowerKernelArguments a module pass (PR #112790)

[Austin Kerbow via llvm-commits]

kerbowa wrote:

> I'd make the refactoring and change to module pass separate PRs.

I can, but the refactoring is actually quite minor, the diff looks big but 90% is just indentation.

https://github.com/llvm/llvm-project/pull/112790