code: private void createEdge(Node fromNode, ControlFlowGraph.Branch branch,
        Node toNode) {
      cfg.createNode(fromNode);
      cfg.createNode(toNode);
      cfg.connectIfNotFound(fromNode, branch, toNode);
    }
docs: Connects the two nodes in the control flow graph.
  
  @param fromNode Source.
  @param toNode Destination.