code: @Override
      public void addVertex(InterproceduralCallGraphVertex v) {
          super.addVertex(v);
          methodDescToVertexMap.put(v.getXmethod().getMethodDescriptor(), v);
      }
docs: /*
  (non-Javadoc)
  
  @see
  edu.umd.cs.findbugs.graph.AbstractGraph#addVertex(edu.umd.cs.findbugs
  .graph.AbstractVertex)