Too much of a good thing. Bernardo Bertolucci tries to jam so much symbolism into “The Last Emperor” (1987), the film becomes exhausting to watch. Long, slow buildup follows long, slow buildup as we see a man born into pageantry and oppression and die under different pageantry and different oppressors. Our Chinese emperor, played by John Lone, is a symbol in himself, spending life as a powerless ruler trapped behind walls and never truly comprehending how others are using him. And yet, because of his inconsistent behavior, he’s not quite tragic enough to carry us through the 163-minute run time.