When your parents are Susan Sarandon and Tim Robbins, you get first dibs on the jam sessions with Eddie Vedder of Pearl Jam. Saturday night, the celeb couple’s son, Miles Robbins, 14, played with his band, the Tangents, at Bar East, on First Avenue and 90th Street. Vedder came as a guest of Sarandon and Robbins, and “Eddie jumped onstage and joined the band for a couple of songs, including a hot cover of ‘Watchtower,’ ” said our spy. “Tim ...