[US fund manager piles $1.2 billion into Alibaba, JD.com, Chinese tech peers in 12 months waiting for policy, valuation payoff] It may be all doom and gloom for Chinese tech stocks for much of the past year, with Alibaba Group Holding at the forefront of a $2 trillion sell-off. One US money manager, however, is making a big bet on a rebound. San Francisco-based Dodge & Cox spent $716 million loading up on the American depositary shares of Alibaba, NetEase, JD.com and Baidu and other Chinese peers in the first three months this year, according to its US regulatory filings….