code: public boolean contains(long startDrId, long endDrId) {
          assert startDrId <= endDrId;
          return endDrId <= getSafePointDrId() || m_map.encloses(range(startDrId, endDrId));
      }
docs: Check if this tracker contains the given range. If the given range is
  before the safe point, it always returns true.
  @return true if the given range can be covered by the tracker.