China has begun an investigation into a months-old Qualcomm Inc. acquisition, taking aim at yet another US technology giant before a pivotal meeting of the leaders of the world’s two largest economies.The State Administration for Market Regulation has opened an antitrust investigation into the takeover of connected-vehicle technology provider Autotalks, a deal announced in June. In a brief statementBloomberg Terminal, the watchdog said it would look into potential violations of the country’s an...