Barry Crimmins is known as a beer-swilling, politically outspoken comic who fostered the talents of the next generation of stand-up comedians in the 1970s and 80s. But he long suppressed his horrific abuse as a child, and eventually opened up about his past in comedy clubs, television shows, and in the political arena. Comedian and director Bobcat Goldthwait tells Crimmins’ story in his documentary, “Call Me Lucky.” The film opens August 7 at the IFC Center.