Guillermo del Toro just won an Oscar for "The Shape of Water," which will likely make "Pacific Rim" recede even further down his resume. But the director's 2013 movie about giant alien invaders versus Rock 'Em, Sock 'Em robots fared well enough internationally to warrant an encore, so enter "Pacific Rim Uprising," a monster mashup of movies past with a notable demographic tilt toward the "Power Rangers" demo.