DataFlowStack: Swift Implementation

[ropwareJB]

Supply an implementation for the DataFlowStack-required interface for DataFlowCall:

  /** Gets an argument to this call as a Node. */
  ArgumentNode getAnArgumentNode(){ none() } // TODO: JB1 return an argument as a DataFlow ArgumentNode

  /** Gets the data flow node corresponding to this call. */
  ExprNode getNode() { none() } // TODO: JB1 return this Call as a Node

  /** Gets the target of the call, as a DataFlowCallable. */
  DataFlowCallable getARuntimeTarget(){ none() } // TODO