Clayton Davis Senior Awards Editor Todd Haynes is the latest auteur to use Cannes as a launching pad for a potential Oscar contender, debuting his delicious dramedy “May December” at the festival on Saturday. Premiering less than one hour after Martin Scorsese’s 202-minute “Killers of the Flower Moon” conquered Cannes, the torrential downpour on Saturday night couldn’t keep many patrons away from taking in the Haynes movie. And not just because the movie reunites the director with his muse Julianne Moore, who he worked wonders with on “Safe” (1995) and “Far from Heaven” (2002), the latter which earned an Oscar nomination for Moore’s performance and one for Haynes’ script.