[llvm] [AMDGPU] Add option to bias SGPR allocation to reduce read hazards (PR #129869)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

Why does this need to be a dynamic property built on top of hints? We can statically change the allocation order in tablegen 

https://github.com/llvm/llvm-project/pull/129869