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;  }