code: private void handleChildMethod(ExecutableElement methodElement) {
      String methodIdentifier = stitchMethodIdentifier(methodElement);
      MethodReferenceNode node = (MethodReferenceNode) elementReferenceMap.get(methodIdentifier);
      if (node == null) {
        node = new MethodReferenceNode(methodElement);
      }
      node.invoked = true;
      elementReferenceMap.put(methodIdentifier, node);
      addToOverrideMap(methodElement);
    }
docs: Adds a node for the child in the elementReferenceMap if it doesn't exist, marks it as declared,
  and adds this method to the override map.
  @param methodElement