Chris Brown Says People Wish Quavo Died Instead of Takeoff

Chris Brown's not fooling around in his beef with Quavo ... dropping a new diss track -- and invoking the name of Quavo's late nephew, and Migos star, Takeoff. The singer-songwriter -- whose well-documented beef with Quavo's reignited in recent days -- put out his new track "Weakest Link" on YouTube and Instagram ... and, he's clearly going for Quavo's throat throughout the track. And, one of his biggest disses…