It would be hilarious if Hashirama never faced Amaterasu and Madara actually doesn't have it. I would laugh my head off if it connects with Hashirama and he says in his Edo-form: "What is this?"
Followed by Tobirama's futile Suiton attacks and another hilarious 'hate hypothesis': "Must be the Uchiha hate. "
Joke aside, the guy is an Edo. If Amaterasu hits him, he will simply get revived.