U.S. AI-related stocks were falling premarket, continuing their rocky week.Oracle's disappointing second-quarter earnings report Wednesday set off a wave of selling in AI stocks, while Broadcom results Thursday prompted further concern.Chip makers Nvidia and AMD dropped 1% and 1.2%, respectively, in premarket trading, while cloud-computing providers Oracle and CoreWeave fell 1% and 1.5%, respectively. Futures for Broadcom dropped 5.2%. ...