helpful pointer

Probably this should go in the docs somewhere or maybe the header files should be fixed.
I'm not sure what the original intent was.

If you want to use the debugging in

#include "llvm/Support/Debug.h"

You will most likely also want to include:

#include "llvm/Support/raw_ostream.h"

Otherwise you will not be able to print things like ints, only strings.

Reed