Dennis Hopper's four decade-plus film career as a performer and filmmaker has gained in stature retrospectively due in part to the canny self-promotion and mythicizing that accompanied his remarkable comeback in the 1980s. That his screen debut, "Rebel Without a Cause" (1955), became the stuff of 50s movie legend helped make the case for his significance. Hopper's later critical and commercial success as the director, writer and star (with Peter Fonda) of "Easy Rider" (1969), one of the zeitgeist films of the 60s, added luster to his story. His subsequent descent into self-indulgence, drugs