General Motors Co.’s Cruise division has landed another $1.2 billion in outside financing, bringing the value of the driverless-car developer to $19 billion. San Francisco-based Cruise said Tuesday it received an equity investment from a group of institutional investors, including mutual-fund company T. Rowe Price Associates Inc. The funding round also included current Cruise investors, including Japan’s SoftBank Group Corp., Honda Motor Co. and GM, Cruise’s majority owner. …