Taxonomy: Ensure that mods to query vars in `pre_term_query` callbacks have an effect.

Previously, it was possible to modify the `query_vars` array, but
the changes would be ignored after `pre_term_query` had finished
running.

Props jfarthing84.
Fixes #39354.
Built from https://develop.svn.wordpress.org/trunk@39625


git-svn-id: http://core.svn.wordpress.org/trunk@39565 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-term-query.php

@@ -305,7 +305,7 @@ class WP_Term_Query {
 		global $wpdb;
 
 		$this->parse_query( $this->query_vars );
-		$args = $this->query_vars;
+		$args = &$this->query_vars;
 
 		// Set up meta_query so it's available to 'pre_get_terms'.
 		$this->meta_query = new WP_Meta_Query();

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-39624';
+$wp_version = '4.8-alpha-39625';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.