Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/user/user.views_execution.inc

@@ -0,0 +1,17 @@
+<?php
+
+/**
+ * @file
+ * Provide views runtime hooks for user.module.
+ */
+
+use Drupal\views\ViewExecutable;
+
+/**
+ * Implements hook_views_query_substitutions().
+ *
+ * Allow replacement of current userid so we can cache these queries.
+ */
+function user_views_query_substitutions(ViewExecutable $view) {
+  return array('***CURRENT_USER***' => \Drupal::currentUser()->id());
+}