def loopless1_dead_nodes(self):
        """
        Same as loopless1(), but with added dead blocks (some of them
        in a loop).
        """
        g = self.from_adj_list(
            {0: [18, 12],
             12: [21],
             18: [21],
             21: [],
             91: [12, 0],
             92: [91, 93],
             93: [92],
             94: [],
             })
        g.set_entry_point(0)
        g.process()
        return g

        Same as loopless1(), but with added dead blocks (some of them
        in a loop).
        
numba/tests/test_flow_control.py