By Lawrence Delevingne (Reuters) – U.S. stocks extended their July rebound on Friday, with the dollar and some longer-term Treasury yields dipping, as traders acted on positive corporate news despite increased labor costs and other inflation indicators. Positive forecasts from Apple Inc and Amazon.com Inc showed resilience in giant companies to survive an economic downturn, with hopes of a less aggressive monetary policy boosting sentiment. The two largest U.S. oil companies, Exxon Mobil and Chevron Corp, also posted record revenue on Friday, bolstered by surging crude oil and natural gas pric…