[llvm] [CodeGen] De-type getMinimalPhysRegClass and related APIs (PR #197495)

[Cullen Rhodes via llvm-commits]

c-rhodes wrote:

rebase picked up #183150 which re-added a typed call after I already de-typed AMDGPU backend. I'm not gonna post another separate PR to fix that again will just update it here

https://github.com/llvm/llvm-project/pull/197495