[llvm] [AMDGPU] misched: avoid subregister dependencies (PR #140255)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

The physreg handling is a bit off here, but it's the less important case. It's more important to get the virtual register case correct first 

https://github.com/llvm/llvm-project/pull/140255