U.S. stock market swings higher despite rising U.S.-China tensions; oil up

NEW YORK (Reuters) - U.S. stocks gyrated on Friday before ending slightly higher, as investors worried about increased China-U.S. trade hostilities and disappointing retail sales figures, while signs of a pick-up in crude demand boosted oil prices.The Trump administration on Friday moved to block global chip supplies to blacklisted telecoms equipment giant Huawei Technologies , spurring fears of Chinese retaliation and hammering shares of U.S. producers of chipmaking equipment. China said it..