Using API graphs instead of points-to.
Unfortunately, some results will be lost because of this, due to the
fact that points-to tracks bitwise operations on small numbers (i.e.
flags), whereas API graphs does no such thing. This means using
something like `stat.S_IWUSR | stat.S_IWGRP` will not work.
A custom type tracker (like the one used for `re` flags) could be used
to recapture this behaviour, but I think that's best left as future
work, as it's not clear to me that this query is actually worth the
effort it would take to implement this.
