[DI] fix preloading script generation

Author: nicolas-grekas

Firewall/AnonymousAuthenticationListener.php

@@ -19,6 +19,9 @@
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(AnonymousToken::class);
+
 /**
  * AnonymousAuthenticationListener automatically adds a Token if none is
  * already present.

Firewall/LegacyListenerTrait.php

@@ -15,6 +15,9 @@
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
 use Symfony\Component\HttpKernel\Event\RequestEvent;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(RequestEvent::class);
+
 /**
  * @deprecated
  *