Remove preloading of unused class

Author: OskarStark

HttpKernel.php

@@ -33,7 +33,6 @@
 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);