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

ErrorRenderer/CliErrorRenderer.php

@@ -15,6 +15,9 @@
 use Symfony\Component\VarDumper\Cloner\VarCloner;
 use Symfony\Component\VarDumper\Dumper\CliDumper;
 
+// Help opcache.preload discover always-needed symbols
+class_exists(CliDumper::class);
+
 /**
  * @author Nicolas Grekas <[email protected]>
  */