Notorious Boston gangster Whitey Bulger came to Deadline’s big awards-season event, The Contenders Presented By Deadline, which took place last month at the DGA Theatre before a sold-out crowd of AMPAS and key guild members. OK, Bulger didn’t appear in person. He’s in prison. But some very key filmmakers who have brought his chilling story to life in Warner Bros’ Black Mass did get a chance to sit down with me and discuss the making of this acclaimed drama, which director…