After [29422], make sure the internal array counter is not reset for the `$wp_filter` global.

Props kovshenin.
See #29070.

Built from https://develop.svn.wordpress.org/trunk@29472


git-svn-id: http://core.svn.wordpress.org/trunk@29250 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/plugin.php

@@ -105,7 +105,7 @@ function add_filter( $tag, $function_to_add, $priority = 10, $accepted_args = 1
  *                  return value.
  */
 function has_filter($tag, $function_to_check = false) {
-	global $wp_filter;
+	$wp_filter = $GLOBALS['wp_filter'];
 
 	$has = ! empty( $wp_filter[ $tag ] );