[llvm] [AMDGPU] GCNRegPressure printing pass for testing. (PR #70031)

[Jay Foad via llvm-commits]

jayfoad wrote:

> P.S. If I understood correctly -print<...> syntax is only available with the new pass manager which isn't available for our target yet?

Yeah, it does not support MachineIR passes (for any target) yet.

https://github.com/llvm/llvm-project/pull/70031