The R-rated “X-Men” spinoff “Logan” slashed into the weekend box office, opening with a massive $85.3 million in North American theaters, according to studio estimates Sunday, while best-picture winner “Moonlight” got a significant, if far from superhero-sized, Oscar bump. The debut of 20th Century Fox’s “Logan,” starring Hugh Jackman as Wolverine, puts it among the ranks of biggest March openings ever and top R-rated debuts.