NEW YORK, Feb 17 : Wall Street stocks eked out nominal gains on Tuesday as investors continued to wrestle with the pros and cons of the artificial intelligence boom, while gold slid and crude dipped as nuclear talks progressed between the United States and Iran. The three main U.S. stock indexes gyrated throughout the session, with the recent tech selloff prompting some bargain hunting, while the dollar gained strength and gold slipped to a one-week low. Worries that companies are over-