* Asian stock markets : tmsnrt.rs/2zpUAr4 * Hong Kong tech stocks hit by regulatory crackdown * Long-term U.S. bond yields hit four-month lows * Fed minutes expected to sound hawkish * Oil prices retreat as OPEC shows signs of cracking SYDNEY, July 7 (Reuters) - Asian share markets stumbled on Wednesday as a bout of risk aversion boosted bonds and the dollar, while investors braced for minutes from the Federal Reserve’s last meeting which could confirm a hawkish turn in U.S. monetary policy. Dealers were hard pressed to find a single catalyst for the sudden mood swing, but a Chinese crackdown on tech companies clearly had an impact. Hong Kong stocks shed another 0.9% to near six-month lows, while U.S.-listed ride-hailing company Didi Global Inc shed more than 20% in New York. Alibaba Group