VM_Word n = node.toWord(); return (n.toInt() / granularity * granularity) == n.toInt();
if (BITS_IN_ADDRESS == 64) return (node.toLong() / granularity * granularity) == node.toLong(); else return (node.toInt() / granularity * granularity) == node.toInt();
  public final boolean isNode (VM_Address node) {    VM_Word n = node.toWord();    return (n.toInt() / granularity * granularity) == n.toInt();  } 