Revert "Remove non-live vregs from GC map on return."

This change causes a test regression on the oat tests, back out until the change also updates the test for the new GC map values.

This reverts commit c0d120a0b1389f1f402d13e20b9e4abd9ab7cd95.

Change-Id: I48bc951b1dad9a9ae83cccf0b5b68ad60fac052c
5 files changed