In place editing of query_vars in WP_Query->get_posts()

[m4ttias]

This is a simple two-liner for making WP_Query->get_posts() edit query_vars in place. It simply makes $q a reference instead of a temporary.

With this patch filters called within get_posts() get more information available to them, making them more powerful.

I can't see why this shouldn't be done.

Seems sensible. The benefit is that hooks called in get_posts can access the latest query var array through $wp_query->query_vars.

(In [3519]) User ref instead of copying. Props m4ttias. fixes #2256