Nikkei hits near 7-1/2-year high on weak yen, US economic optimism

* Exporter shares reap rewards of weaker yen * Topix hits 6-year peak * Toymaker Tomy soars on share buyback By Thomas Wilson TOKYO, Dec 4(Reuters) - Japanese stocks jumped to a near 7-1/2-year high on Thursday as a weak yen drove exporter shares, while the mood was also supported by data showing U.S. economic resilience and expectations of more stimulus from the European Central Bank. The Nikkei benchmark rose 0.8 percent to 17,856.89 by 0124 GMT after earlier hitting 17,91