Petra Vlhova of Slovakia came from far behind on Wednesday to claim Olympic slalom gold at the Beijing Games while big American rival Mikaela Shiffrin crashed out again. Vlhova was on fire in the second run to win from eighth place in the first ahead of reigning world champion Katharina Liensberger of Austria and Swiss Wendy Holdener. Shiffrin meanwhile lasted only a few seconds in the first run after also going out early in the giant slalom, first-run leader Lena Dürr of Germany faded to fourth and giant slalom winner Sara Hector straddled a gate late in the second run after holding a big lea…