test: add new.target add-on regression test

Add a test that checks that new.target inheritance works when inheriting
from a constructor defined in C++.

PR-URL: https://github.com/nodejs/node/pull/9689
Refs: https://github.com/nodejs/node/issues/9288
Refs: https://github.com/nodejs/node/pull/9293


Reviewed-By: Anna Henningsen <anna@addaleax.net>