Don't clear object relationship caches on term update.

Since [37573], object relationship caches (`{$taxonomy}_relationships`)
contain term IDs rather than term objects. See #36814. As such, it's no longer
necessary to clear these caches when a term is updated; none of the data that's
changed on update (name, description, count, etc) is stored in the relationship
cache.

Fixes #36251.
Built from https://develop.svn.wordpress.org/trunk@37593

Author: boonebgorges

wp-includes/taxonomy.php

@@ -2948,13 +2948,6 @@ function wp_update_term( $term_id, $taxonomy, $args = array() ) {
 	 */
 	do_action( 'edited_term_taxonomy', $tt_id, $taxonomy );
 
-	// Clean the relationship caches for all object types using this term.
-	$objects = $wpdb->get_col( $wpdb->prepare( "SELECT object_id FROM $wpdb->term_relationships WHERE term_taxonomy_id = %d", $tt_id ) );
-	$tax_object = get_taxonomy( $taxonomy );
-	foreach ( $tax_object->object_type as $object_type ) {
-		clean_object_term_cache( $objects, $object_type );
-	}
-
 	/**
 	 * Fires after a term has been updated, but before the term cache has been cleaned.
 	 *

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37592';
+$wp_version = '4.6-alpha-37593';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.