(Adds details on cost-saving program in paragraphs 15-16, updates shares) By Deena Beasley April 25 (Reuters) – Bristol Myers Squibb on Thursday reported a first-quarter loss as charges related to its recent acquisitions of Karuna Therapeutics, RayzeBio and Mirati Therapeutics offset a 5% increase in revenue. The New Jersey-based drugmaker posted a loss of $4.40 […]