if (Assert.VERIFY_ASSERTIONS) Assert._assert((len & (BYTES_IN_INT-1)) == 0 && (start.toInt() & (BYTES_IN_INT-1)) == 0);
  public static void set (Address start, int len, int v) throws InlinePragma {    for (int i=0; i < len; i += BYTES_IN_INT)       start.store(v, Offset.fromInt(i));  }