Inner JavaVisitor in findAllValues to track multiple subtrees on left side of assignment

[aaronist]

As of right now, findAllValues in VarAccess can traverse one layer on the subtree of a VarAccess to track value assignments on a variable like this.i. However, suppose we have the following case (where this.self == this and there exists a method called getSelf that returns self):

this.self.getSelf().self = this;

We would ultimately want to track values for this type of VarAccess with the inner JavaVisitor.