U.S. stock futures posted early gains, shaking off weakness in Asia and Europe, as investors become increasingly jittery about the possibility that the coronavirus is becoming a worldwide pandemic. Here’s were the main moves during the pre-market session, as of 9:10 a.m. ET: S&P 500 futures (ES=F): 3,234.25 up +10.00  Dow futures (YM=F): up 112.00, SPY =...