WASHINGTON :The International Monetary Fund revised up Asia's economic growth forecast on Thursday, but warned of risks to the outlook from trade policy uncertainty and geopolitical tensions. Economic activity in the Asia-Pacific was holding up better than expected in April, despite the region bearing the brunt of U.S. tariffs, said Krishna Srinivasan, director of the IMF's Asia Pacific Department. "The region is once again set to contribute the lion's share of global growth - about 60 per cent,