Merge branch '4.4' into 5.0

* 4.4:
  [DI] Fix CheckTypeDeclarationPass
  [Security/Http] don't require the session to be started when tracking its id
  [DI] fix preloading script generation

Author: nicolas-grekas

HttpClientKernel.php

@@ -21,6 +21,9 @@
 use Symfony\Component\Mime\Part\TextPart;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(ResponseHeaderBag::class);
+
 /**
  * An implementation of a Symfony HTTP kernel using a "real" HTTP client.
  *

HttpKernel.php

@@ -32,6 +32,18 @@
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(LegacyEventDispatcherProxy::class);
+class_exists(ControllerArgumentsEvent::class);
+class_exists(ControllerEvent::class);
+class_exists(ExceptionEvent::class);
+class_exists(FinishRequestEvent::class);
+class_exists(RequestEvent::class);
+class_exists(ResponseEvent::class);
+class_exists(TerminateEvent::class);
+class_exists(ViewEvent::class);
+class_exists(KernelEvents::class);
+
 /**
  * HttpKernel notifies events to convert a Request object to a Response one.
  *

Kernel.php

@@ -38,6 +38,9 @@
 use Symfony\Component\HttpKernel\DependencyInjection\AddAnnotatedClassesToCachePass;
 use Symfony\Component\HttpKernel\DependencyInjection\MergeExtensionConfigurationPass;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(ConfigCache::class);
+
 /**
  * The Kernel is the heart of the Symfony system.
  *
@@ -716,6 +719,7 @@ protected function dumpContainer(ConfigCache $cache, ContainerBuilder $container
             'as_files' => true,
             'debug' => $this->debug,
             'build_time' => $container->hasParameter('kernel.container_build_time') ? $container->getParameter('kernel.container_build_time') : time(),
+            'preload_classes' => array_map('get_class', $this->bundles),
         ]);
 
         $rootCode = array_pop($content);