Greedy: Take copy hints involving subregisters (#159570)
Previously this would only accept full copy hints. This relaxes
this to accept some subregister copies. Specifically, this now
accepts:
- Copies to/from physical registers if there is a compatible
super register
- Subreg-to-subreg copies
This has the potential to repeatedly add the same hint to the
hint vector, but not sure if that's a real problem.
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