previouslyKnownAs =  new HashMap<ValueNumber, AvailableLoad> ();
	public ValueNumberFrame(int numLocals) {		super(numLocals);		if (REDUNDANT_LOAD_ELIMINATION) {			availableLoadMap = new HashMap<AvailableLoad, ValueNumber[]>();			mergedLoads =  new HashMap<AvailableLoad,ValueNumber> ();		}	}