Merge branch '3.4'

* 3.4:
  [DI] Check privates before resolving alias in Container::initialized
  [FrameworkBundle] Fix tests

Container.php

@@ -294,14 +294,14 @@ public function initialized($id)
             return false;
         }
 
-        if (isset($this->aliases[$id])) {
-            $id = $this->aliases[$id];
-        }
-
         if (isset($this->privates[$id])) {
             @trigger_error(sprintf('Checking for the initialization of the "%s" private service is deprecated since Symfony 3.4 and won\'t be supported anymore in Symfony 4.0.', $id), E_USER_DEPRECATED);
         }
 
+        if (isset($this->aliases[$id])) {
+            $id = $this->aliases[$id];
+        }
+
         return isset($this->services[$id]);
     }