Rebecca Davis editorZhang Yimou’s snowy period spy thriller “Cliff Walkers” debuted in China this Labor Day holiday weekend with $37.7 million. But it was outrun by local rom-com “My Love,” which took a comfortable box office victory.That tale of young love starring Taiwan’s Greg Hsu and Zhang Ruonan of the popular TV show “Cry Me A Sad River” opened Friday to earn $65.1 million over three days, according to data from Artisan Gateway.