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