The once tech-adverse investor has indirectly put a substantial amount of capital into the technology of the moment.The leader of Berkshire Hathaway, Warren Buffett, was a tech stock holdout for decades. Nothing lasts forever, though, and largely thanks to his lieutenants Ted Wechsler and Todd Combs, Berkshire is now a major institutional investor in such equities. As such, it's also indirectly at the front of the artificial intelligence (AI) revolution. In fact, nearly one-quarter of Berkshire's equity por ...