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

AcceptHeader.php

@@ -11,6 +11,9 @@
 
 namespace Symfony\Component\HttpFoundation;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(AcceptHeaderItem::class);
+
 /**
  * Represents an Accept-* header.
  *

Request.php

@@ -15,6 +15,14 @@
 use Symfony\Component\HttpFoundation\Exception\SuspiciousOperationException;
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(AcceptHeader::class);
+class_exists(FileBag::class);
+class_exists(HeaderBag::class);
+class_exists(HeaderUtils::class);
+class_exists(ParameterBag::class);
+class_exists(ServerBag::class);
+
 /**
  * Request represents an HTTP request.
  *

Response.php

@@ -11,6 +11,9 @@
 
 namespace Symfony\Component\HttpFoundation;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(ResponseHeaderBag::class);
+
 /**
  * Response represents an HTTP response.
  *

Session/Session.php

@@ -18,6 +18,11 @@
 use Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage;
 use Symfony\Component\HttpFoundation\Session\Storage\SessionStorageInterface;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(AttributeBag::class);
+class_exists(FlashBag::class);
+class_exists(SessionBagProxy::class);
+
 /**
  * @author Fabien Potencier <[email protected]>
  * @author Drak <[email protected]>

Session/Storage/NativeSessionStorage.php

@@ -17,6 +17,11 @@
 use Symfony\Component\HttpFoundation\Session\Storage\Proxy\AbstractProxy;
 use Symfony\Component\HttpFoundation\Session\Storage\Proxy\SessionHandlerProxy;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(MetadataBag::class);
+class_exists(StrictSessionHandler::class);
+class_exists(SessionHandlerProxy::class);
+
 /**
  * This provides a base class for session attribute storage.
  *