Merge branch '5.2' into 5.x

* 5.2:
  Stop using deprecated ArrayCache from Doctrine
  [EventDispatcher] fix registering subscribers twice on edge-case
  [Intl] fix Locale::getFallback() throwing exception on long $locale

Author: nicolas-grekas

Test/DoctrineTestHelper.php

@@ -12,7 +12,6 @@
 namespace Symfony\Bridge\Doctrine\Test;
 
 use Doctrine\Common\Annotations\AnnotationReader;
-use Doctrine\Common\Cache\ArrayCache;
 use Doctrine\ORM\Configuration;
 use Doctrine\ORM\EntityManager;
 use Doctrine\ORM\Mapping\Driver\AnnotationDriver;
@@ -72,8 +71,6 @@ public static function createTestConfiguration()
         $config->setProxyDir(sys_get_temp_dir());
         $config->setProxyNamespace('SymfonyTests\Doctrine');
         $config->setMetadataDriverImpl(new AnnotationDriver(new AnnotationReader()));
-        $config->setQueryCacheImpl(new ArrayCache());
-        $config->setMetadataCacheImpl(new ArrayCache());
 
         return $config;
     }