if (VM.VerifyAssertions) VM.assert(index <= bcLength);
if (VM.VerifyAssertions) VM._assert(index <= bcLength);
  private final int getSignedShort(int index) {    if (VM.VerifyAssertions) VM.assert(index <= bcLength);    int i = bcodes[index++] << 8;    i |= (bcodes[index] & 0xFF);    return (int)i;  }