By Shinichi Saoshiro TOKYO (Reuters) - Asian stocks edged up on Wednesday after upbeat U.S. economic growth data calmed investor anxiety over a deteriorating global outlook, while the Australian dollar languished near four-year lows against the dollar. Oil prices were also under pressure as major oil producing nations failed to agree on curbs to output ahead of an OPEC meeting on Thursday. The U.S. government upgraded its reading on third quarter gross domestic product to 3.9 percent on Tuesday from 3.5 percent reported last month. ...