Issue #1387766 by dereine: Added Use fast drupal static pattern for locale.

core/modules/locale/locale.module

@@ -634,7 +634,14 @@ function locale_language_delete($language) {
  */
 function locale($string = NULL, $context = NULL, $langcode = NULL) {
   global $language;
-  $locale_t = &drupal_static(__FUNCTION__);
+
+  // Use the advanced drupal_static() pattern, since this is called very often.
+  static $drupal_static_fast;
+  if (!isset($drupal_static_fast)) {
+    $drupal_static_fast['locale'] = &drupal_static(__FUNCTION__);
+  }
+  $locale_t = &$drupal_static_fast['locale'];
+
 
   if (!isset($string)) {
     // Return all cached strings if no string was specified