int index = readUnsignedShort();
  final VM_Method getMethodReference() {    if (VM.VerifyAssertions)      VM.assert(opcode == JBC_invokevirtual || opcode == JBC_invokespecial ||                opcode == JBC_invokestatic || opcode == JBC_invokeinterface);    int index = readUnsignedShort();    return declaringClass.getMethodRef(index);  }