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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _post_process(self):
 """ There are cases where a loop has two overlapping loop headers thanks to the way VEX is dealing with continuous instructions. As we were breaking the connection between the second loop header and its successor, we shall restore them in our CDG. """

        # TODO: Verify its correctness
        loop_back_edges = self._cfg.get_loop_back_edges()
        for b1, b2 in loop_back_edges:
            self._graph.add_edge(b1, b2)