RFC: Adding a chapter on creating object file to the Kaleidoscope tutorial

I believe that the Kaleidoscope tutorial would really benefit from a
chapter on emitting object files. It's a classic compiler use case
that doesn't seem as well covered by the existing LLVM docs.

I've written a chapter and I'd love to hear any feedback you might
have. http://reviews.llvm.org/D18070

I've proposed two reviewers on the patch, but since the tutorial is
relevant to so many users I though I'd mention it here too.

Thanks
Wilfred

I’ve commented on the patch.

I’ve added a comment on the patch.