Add nodes for each global declarations in the result graph.

        No edges are added as there are no type builtin type dependencies.

def prepare(self, node):
        """
        Add nodes for each global declarations in the result graph.

        No edges are added as there are no type builtin type dependencies.
        """
        super(TypeDependencies, self).prepare(node)
        for v in self.global_declarations.values():
            self.result.add_node(v)
        self.result.add_node(TypeDependencies.NoDeps)