Include intrin.h before windows.h as a workaround for the x64 self-host

On x64, windows.h doesn't include intrin.h for intrinsics.  It just
declares them in the global namespace and uses them, expecting the
compiler to lower it as a builtin.  We basically need to do this in
clang, eventually.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208023 91177308-0d34-0410-b5e6-96231b3b80d8