if (numWordsProduced == Constants.UNPREDICTABLE) throw new IllegalStateException();
if (numWordsProduced == Constants.UNPREDICTABLE) throw new InvalidBytecodeException("Unpredictable stack productions");
	public int getNumWordsProduced(Instruction ins) {		int numWordsProduced = ins.produceStack(cpg);		if (numWordsProduced == Constants.UNPREDICTABLE) throw new IllegalStateException();		return numWordsProduced;	}