"Thanks to Lattner’s online resume and other sources, we know that LLVM is “deeply integrated” with Xcode, and that it was used to build the latest versions of Mac OS X and iOS."

Ugh. Linkbait headline and "brilliant" reporting--the "other sources" must be the entire front page of a Google search for "Xcode LLVM".

It seems like an incredible stretch to claim that it's the last thread holding Apple and Google together. I do not believe that there is a single Google or Apple engineer that would not want to reuse a tool or a library between the two companies.