Matt Arsenault 55a29c6b71 VirtRegMap: Support partially allocated virtual registers ...

Don't assert if there are unassigned virtual registers.  Maintain
LiveIntervals by removing the RegUnits for allocated registers, since
they should not longer be necessary.

One part I find somewhat questionable is the special handling
necessary for handleIdentityCopy. The LiveIntervals for the relevant
regunits needs to be removed.

2021-04-29 21:51:05 -04:00

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