BOSTON — Kyrie Irving had 11 straight Boston points down the stretch and scored 17 in all in the last 8:06 of the fourth quarter. Then in overtime, he really turned it on. The Celtics guard made or assisted on every basket in the extra period, finishing with 11 assists and a season-high 43 points on Friday night to lead Boston to a 123-116 victory over the Toronto Raptors. “Man, he made some shots tonight where you’re just like, ‘Wow,'” forward Gordon Hayward said.