[llvm] [MachineSink] Remove subrange of live-ins from super register as well. (PR #159145)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> > move this logic into a directly
> 
> @arsenm Thanks for your comment. Just wanted to make sure I understand it correctly. As a quick fix, we can move the logic in this PR as is into MachineBasicBlock::removeLiveIn() for example, and then we can fix live-in properly by using regunits in a future PR. 

Yes (although we may need both variants and not just make the current one subreg aware)

> Or do you want me to work on changing live-in representation directly? Thanks.

That's a much bigger change for later



https://github.com/llvm/llvm-project/pull/159145