Merge branch '4.3' into 4.4

* 4.3:
  gracefully handle missing event dispatchers
  [Cache] fix memory leak when using PhpArrayAdapter
  fix parsing negative octal numbers
  [SecurityBundle] Properly escape regex in AddSessionDomainConstraintPass
  [Config] never try loading failed classes twice with ClassExistenceResource

Author: nicolas-grekas

Workflow.php

@@ -43,7 +43,13 @@ public function __construct(Definition $definition, MarkingStoreInterface $marki
     {
         $this->definition = $definition;
         $this->markingStore = $markingStore ?: new MultipleStateMarkingStore();
-        $this->dispatcher = null !== $dispatcher ? LegacyEventDispatcherProxy::decorate($dispatcher) : null;
+
+        if (null !== $dispatcher && class_exists(LegacyEventDispatcherProxy::class)) {
+            $this->dispatcher = LegacyEventDispatcherProxy::decorate($dispatcher);
+        } else {
+            $this->dispatcher = $dispatcher;
+        }
+
         $this->name = $name;
     }