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

ValidatorBuilder.php

@@ -33,6 +33,11 @@
 use Symfony\Contracts\Translation\TranslatorInterface;
 use Symfony\Contracts\Translation\TranslatorTrait;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(TranslatorInterface::class);
+class_exists(LocaleAwareInterface::class);
+class_exists(TranslatorTrait::class);
+
 /**
  * @author Bernhard Schussek <bschussek@gmail.com>
  */