Update to drupal-org-drupal 8.0.0-rc2. For more information, see https://www.drupal.org/node/2598668

core/lib/Drupal/Core/Cache/ApcuBackend.php

@@ -68,7 +68,7 @@ class ApcuBackend implements CacheBackendInterface {
    * @return string
    *   The APCu key for the cache item ID.
    */
-  protected function getApcuKey($cid) {
+  public function getApcuKey($cid) {
     return $this->binPrefix . $cid;
   }
 
@@ -178,14 +178,8 @@ class ApcuBackend implements CacheBackendInterface {
     $cache->serialized = 0;
     $cache->data = $data;
 
-    // apc_store()'s $ttl argument can be omitted but also set to 0 (zero),
-    // in which case the value will persist until it's removed from the cache or
-    // until the next cache clear, restart, etc. This is what we want to do
-    // when $expire equals CacheBackendInterface::CACHE_PERMANENT.
-    if ($expire === CacheBackendInterface::CACHE_PERMANENT) {
-      $expire = 0;
-    }
-    apc_store($this->getApcuKey($cid), $cache, $expire);
+    // Expiration is handled by our own prepareItem(), not APCu.
+    apc_store($this->getApcuKey($cid), $cache);
   }
 
   /**

core/lib/Drupal/Core/Cache/CacheFactory.php

@@ -13,7 +13,6 @@ namespace Drupal\Core\Cache;
 use Drupal\Core\Site\Settings;
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class CacheFactory implements CacheFactoryInterface,  ContainerAwareInterface {
 

core/lib/Drupal/Core/Cache/CacheableRedirectResponse.php

@@ -0,0 +1,26 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Cache\CacheableRedirectResponse.
+ */
+
+namespace Drupal\Core\Cache;
+
+use Symfony\Component\HttpFoundation\RedirectResponse;
+
+/**
+ * A RedirectResponse that contains and can expose cacheability metadata.
+ *
+ * Supports Drupal's caching concepts: cache tags for invalidation and cache
+ * contexts for variations.
+ *
+ * @see \Drupal\Core\Cache\Cache
+ * @see \Drupal\Core\Cache\CacheableMetadata
+ * @see \Drupal\Core\Cache\CacheableResponseTrait
+ */
+class CacheableRedirectResponse extends RedirectResponse implements CacheableResponseInterface {
+
+  use CacheableResponseTrait;
+
+}