Shares of companies tied to artificial intelligence infrastructure tumbled Tuesday after a report that OpenAI has fallen short of internal growth expectations, raising fresh questions about whether the pace of spending across the sector is sustainable.Oracle, which has a $300 billion, five-year partnership to supply computing power to OpenAI for AI operations, dropped more than 4%. Chipmakers including Nvidia, Broadcom and Advanced Micro Devices declined between roughly 3% and 4%. Qualcomm pulle...