Stephen Spinella originated the role of the young AIDS patient at the center of Tony Kushner’s drama in its 1991 world premiere, and he won back-to-back Tony Awards for it in 1993 and ’94. This spring, in a revival at Berkeley Repertory Theater in California, Spinella will play the part farthest from Prior’s type (and, arguably, Spinella’s own): the furious, ailing, closeted and desperate lawyer who made his name as an anti-Communist hatchet man for Sen. Joseph McCarthy.