public final static int resetGCBitsForCopy(VM_Address fromObj, int forwardingWord, int bytes) { return (forwardingWord & ~HybridHeader.GC_BITS_MASK) | matureSpace.getInitialHeaderValue();
public final static VM_Word resetGCBitsForCopy(VM_Address fromObj, VM_Word forwardingWord, int bytes) { return forwardingWord.and(HybridHeader.GC_BITS_MASK.not()).or(matureSpace.getInitialHeaderValue());
  public final static int resetGCBitsForCopy(VM_Address fromObj,                                             int forwardingWord, int bytes) {    return (forwardingWord & ~HybridHeader.GC_BITS_MASK) | matureSpace.getInitialHeaderValue();  }