[llvm] [AMDGPU] Add AGPR pressure tracking (PR #214745)

[Romanov Vlad via llvm-commits]

romanovvlad wrote:

> Most of the changes are mechanical. It looks fine to me, but IIRC we have the AV super RC. How do we differentiate them here?

AFAIK, AV regs are tracked as part of VGPR regs (https://github.com/llvm/llvm-project/pull/214745/changes#diff-0cc602cd384aebd0894c4e02f293602abf32a93d143d90269b4eb4b20cfdc8bfL492), this patch doesn't change how they are handled.

https://github.com/llvm/llvm-project/pull/214745