Added cloc, a script to count lines of code

It gives out the physical LOC, i.e., without comments, that's useful, because RTruffleSOM doesn't have license headers everywhere, I think.

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added script to generate some basic LOC and churn metrics

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Updated graal

Signed-off-by: Stefan Marr <git@stefan-marr.de>