UPDATE 1-U.S.-based stock funds attract $8.9 bln over week -Lipper

(Adds additional flow data, market performance, analyst comment, table) By Sam Forgione NEW YORK, April 10 (Reuters) - Investors in U.S.-based funds poured $8.9 billion into stock funds in the week ended April 9, even as equity markets were hit with sharp selling that particularly weighed on tech and biotech shares, data from Thomson Reuters' Lipper service showed on Thursday. The net inflows into stock funds were the biggest in four weeks. Stock mutual funds attracted $3.1 billion