A woman uses her mobile phone as she walks past the logo of Japan's telecommunications giant SoftBank in Tokyo on December 25, 2013. Toru Yamanaka | Afp | Getty ImagesShares of Asian AI-linked companies and tech firms fell Wednesday, tracking declines in U.S. peers, as investors turned wary of stretched valuations in the market's most crowded trades.Japan's SoftBank, a key backer of AI-related firms, saw shares drop 13%, while semiconductor testing equipment maker Advantest declined over 8%, chi...