@Override
  public void fillSerializedValue(BytesAndBitsForCompactor wrapper, byte userBits) {
    if (isSerialized()) {
      userBits = EntryBits.setSerialized(userBits, true);
    }
    wrapper.setOffHeapData(this, userBits);
  }
Used to create a Chunk given an existing, already allocated, memoryAddress. The off heap header
has already been initialized.
geode-core/src/main/java/org/apache/geode/internal/offheap/OffHeapStoredObject.java