What exception handling model does the Clang x64 Windows compiler use?

I've just downloaded the 3.7.1 LLVM for Windows x64 (from here), and I was wondering if the clang++ inside this uses SEH exception handling or SJLJ, or something else? In particular, I believe SEH is the best on Windows for dealing with C++ exceptions thrown while behind a system call, so this compiler would be more useful to me if it uses SEH.