UPDATE 1-U.S.-based stock funds gain $7.6 bln, most since January-ICI

* Fears about Fed scaling back stimulus eased * Stock fund gains much larger than previous week * Bond funds suffered outflows of $8.1 bln in latest week By Sam Forgione NEW YORK, July 17 (Reuters) - Investors in mutual funds based in the United States poured $7.6 billion into stock funds in the latest week, the most since late January, as fears about a pullback in the Federal Reserve's stimulus eased, data from the Investment Company Institute showed on Wednesday. The infl