When priming the cache for taxonomy term nav items, don't fetch term descendants.

Descending the term tree causes unnecessary database queries when priming the
cache for a term with many descendants.

Fixes #31724.
Built from https://develop.svn.wordpress.org/trunk@32294


git-svn-id: http://core.svn.wordpress.org/trunk@32265 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/nav-menu.php

@@ -585,7 +585,10 @@ function wp_get_nav_menu_items( $menu, $args = array() ) {
 
 		if ( ! empty( $terms ) ) {
 			foreach ( array_keys($terms) as $taxonomy ) {
-				get_terms($taxonomy, array('include' => $terms[$taxonomy]) );
+				get_terms( $taxonomy, array(
+					'include' => $terms[ $taxonomy ],
+					'hierarchical' => false,
+				) );
 			}
 		}
 		unset($terms);