Daimler’s Mercedes-Benz and Nissan’s Infiniti plan to pool development of compact cars to cut costs, expand the German carmaker’s North American production and broaden the Infiniti lineup, people familiar with the matter said.The outline deal, which reinforces Daimler’s relationship with the Renault-Nissan alliance, will see Nissan build the next-generation Mercedes GLA SUV and related models in Mexico alongside all-new cars for its own Infiniti brand, said the sources, who asked not to be identified.