[llvm] [AMDGPU] NFCI: Track AV Register Pressure separately (PR #149863)

[Lucas Ramirez via llvm-commits]

lucas-rami wrote:

The last commit added changes to the scheduler, is this expected or meant to be part of a future change? Asking since it no longer seems NFC with the scheduler/lit test changes.

https://github.com/llvm/llvm-project/pull/149863