By Elaine Lies TOKYO, Jan 23 (Reuters) - Singapore restaurant Iggy's fell from first place as the top dining spot in Asia after holding the crown for two straight years, while a Japanese restaurant in the city state soared to second place in a regional dining guide. Celebrity chef Joel Robuchon saw his Macau restaurant Robuchon au Dome, previously known as Robuchon a Galera, top the list of Asia's 20 best restaurants in The Miele Guide 2013, the guide's fifth edition, while L'Atelier de Joel Robuchon in Hong Kong took third place.