public IsNullValueFrameModelingVisitor(ConstantPoolGen cpg, AssertionMethods assertionMethods) {
public IsNullValueFrameModelingVisitor(IsNullValueAnalysis analysis, ConstantPoolGen cpg, AssertionMethods assertionMethods) {
	public IsNullValueFrameModelingVisitor(ConstantPoolGen cpg, AssertionMethods assertionMethods) {		super(cpg);		this.assertionMethods = assertionMethods;	}