SYDNEY, May 1 : Asian shares rallied in relief on Friday as oil prices came off the boil and upbeat company earnings pulled investors into tech stocks, while Japan's first yen-buying intervention in two years steadied the battered currency. Apple amplified the cheer by beating forecasts and providing an upbeat outlook for sales, though it did warn of chip supply constraints. Its shares rose 2.7 per cent in extended trading, adding to gains of 10 per cent in both Caterpillar and Alphabet as they