Generac Holdings Inc. agreed to supply up to $8 billion worth of generators for Amazon.com Inc.’s data centers and issued a warrant for a stake in the company, according to a Wednesday securities filing. Generac shares jumped as much as 45% in after-market trading on the news.The arrangement is the latest example of a tech giant striking a warrant-linked deal with a power equipment supplier to keep up with artificial intelligence-driven electricity demand. Oracle took a similar stake in fuel-cel...