Taxonomy: Update `register_taxonomy` hook to use `WP_Taxonomy` object.

Casts `WP_Taxonomy` to an array for passing to the `register_taxonomy` hook. This maintains backward compatibility with the processed arguments used prior to WordPress 4.7.

Fixes #38765.

Built from https://develop.svn.wordpress.org/trunk@39283


git-svn-id: http://core.svn.wordpress.org/trunk@39223 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/taxonomy.php

@@ -393,7 +393,7 @@ function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
 	 * @param array|string $object_type Object type or array of object types.
 	 * @param array        $args        Array of taxonomy registration arguments.
 	 */
-	do_action( 'registered_taxonomy', $taxonomy, $object_type, $args );
+	do_action( 'registered_taxonomy', $taxonomy, $object_type, (array) $taxonomy_object );
 }
 
 /**

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta4-39282';
+$wp_version = '4.7-beta4-39283';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.