sinterface IManagedObjectCollector64 {
  // notify collector that there is an object in a location
  public void noteObject(long start, long size);
  
  // same plus callback after compaction
  public void noteObject(long start, long size, IVF1<long> updateAddress);
  
  // notify collector that there is a pointer in a location
  public void notePointer(long addr);
  
  // notify collector that there is a pointer array in a location
  public void notePointerArray(long start);
  
  // call after collectAndCompact to get new location of objects
  long getNewLocation(long addr);
}

Began life as a copy of #1029239