Yankees’ Masahiro Tanaka has gone from All-Star to question mark

BOSTON — Masahiro Tanaka made Yankees history at Fenway Park on Thursday night. And not the good kind. Tanaka was pummeled for a dozen runs — all earned — in a 19-3 loss to the Red Sox in a horrid outing to open a four-game series. Tanaka is the first Yankees starter to allow 12…