If these analysts are correct, shares of Palantir and Arm are headed for sharp declines.Enthusiasm about artificial intelligence (AI) has pushed the S&P 500 (^GSPC 1.02%) to dozens of record highs in 2024. Palantir Technologies (PLTR 3.76%) and Arm Holdings (ARM 2.29%) have benefited greatly from that momentum, notching year-to-date gains of 61% and 145%, respectively.However, some Wall Street analysts think the stocks have gotten ahead of themselves. Their 12-month price targets imply substantial downside ...