[llvm] [AMDGPU][NPM] Port AMDGPUArgumentUsageInfo to NPM (PR #170886)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> > This resulted in fallback to FixedABIFunctionInfo which assumes all implicit arguments are needed, generating unnecessary register setup code for entry functions.
> 
> @arsenm Is there something specific you'd like me to clarify about this statement?

I was wondering if we actually need this pass anymore. We infer the attributes directly on the functions (and could also do the same for the call sites). We could then just directly read the attributes without the analysis 

https://github.com/llvm/llvm-project/pull/170886