In the compaction phase of a full-GC, we perform bitmap-iteration for two purposes:

1. Inside the dense-prefix, adjust pointers in live ranges and fill dead ranges with fillers.
2. Outside the dense-prefix, to relocate objects and adjust pointers in live ranges.

For work partitioning, such bitmap-iteration is done on a region granularity. If the final object on a region extends to the next region, the iteration logic will end with an "incomplete" status. The caller is then responsible for invoking the live-closure itself.

To reduce the number of possible return statuses, the iteration logic can directly invoke the live-closure on the final object in a region.