if (IsNullValueAnalysisFeatures.TRACK_KNOWN_VALUES) {
if (trackValueNumbers) {
	public void toExceptionValues() {		for (int i = 0; i < getNumSlots(); ++i)			setValue(i, getValue(i).toExceptionValue());		if (IsNullValueAnalysisFeatures.TRACK_KNOWN_VALUES) {			Map<ValueNumber, IsNullValue> replaceMap = new HashMap<ValueNumber, IsNullValue>();			for (Map.Entry<ValueNumber, IsNullValue> entry : knownValueMap.entrySet()) {				replaceMap.put(entry.getKey(), entry.getValue().toExceptionValue());			}			this.knownValueMap = replaceMap;		}	}