With the Hollywood stunt community continuing to lobby for its own Academy Award category, “The Fall Guy” arrives as Exhibit A in the case for a stunts Oscar. Helmed by stuntman-turned-director David Leitch (“Atomic Blonde,” “Bullet Train”; producer of the John Wick series), it’s an action-comedy-romance-mystery, heavy on the flipping cars, high-speed chase scenes and plummets from tall buildings. Not surprisingly, plot is the least important thing here. Surprisingly, the quieter romantic comedy scenes are the best.