Introduce `$post_type` param for `count_user_posts()`.

Props Caspie, engelen, DrewAPicture.
Fixes #21364.
Built from https://develop.svn.wordpress.org/trunk@30322


git-svn-id: http://core.svn.wordpress.org/trunk@30321 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Pass query object to 'the_post' filter.

Props tlovett1.
Fixes #30327.
Built from https://develop.svn.wordpress.org/trunk@30323


git-svn-id: http://core.svn.wordpress.org/trunk@30322 1a063a9b-81f0-0310-95a4-ce76da25c4cd