Wall Street stocks slid late in the session to end lower on Tuesday, unable to sustain gains made after bumper earnings from Walmart WMT.N and Home Depot HD.N. By Hideyuki Sano TOKYO, May 19 (Reuters) - Asian stocks dipped and cryptocurrencies extended losses on Wednesday as uncertainties over inflation prompted investors to reduce exposure to riskier assets for now. "Inflation remains the biggest theme, whether it is real and whether the Fed may need to change its policy because of that," said Kazushige Kaida, head of forex sales at State Street Bank's Tokyo branch.