```
void G1ConcurrentMark::report_object_count(bool mark_completed) {
  // Depending on the completion of the marking liveness needs to be determined
  // using either the bitmap or after the cycle using the scrubbing information.
  if (mark_completed) {
    G1ObjectCountIsAliveClosure is_alive(_g1h);
    _gc_tracer_cm->report_object_count_after_gc(&is_alive, _g1h->workers());
  } else {
    G1CMIsAliveClosure is_alive(_g1h);
    _gc_tracer_cm->report_object_count_after_gc(&is_alive, _g1h->workers());
  }
}
```

`report_object_count_after_gc` is called even when mark isn't complete, but accurate liveness info require complete-marking.

Remove the partial-result case.