return (VM_Interface.readAvailableBitsWord(ref)& MARK_BIT_MASK) != value;
return !(VM_Interface.readAvailableBitsWord(ref).and(MARK_BIT_MASK).EQ(value));
  static public boolean testMarkBit(VM_Address ref, int value)    throws VM_PragmaUninterruptible, VM_PragmaInline {    return (VM_Interface.readAvailableBitsWord(ref)& MARK_BIT_MASK) != value;  }