Google are going to make it with or without LLVM's cooperation. If it's done with LLVM, it's highly probable that LLVM won't let them extend,extinguish libc. G

Google are going to make it with or without LLVM's cooperation. If it's done with LLVM, it's highly probable that LLVM won't let them extend,extinguish libc. Google's code will be carefully evaluated by a relatively neutral party: LLVM. If Google does it alone, they will write whatever code they want. They'll be free to extend, extinguish libc.