Vikram Rangnekar grew up in Mumbai, studied computer science at the University of Delaware, and by the waning days of the Obama administration had been working in Silicon Valley for almost six years. Through his job as a software engineer at LinkedIn Corp., Rangnekar secured an H-1B, the temporary visa for high-skilled workers, and the company began the process of sponsoring his green card way back in 2012. But he had dozens of senior colleagues from India who’d been waiting a decade or more for their green cards and still didn’t have them. “Some said it’d take 20