[HttpKernel] fixed wrong reference in TraceableEventDispatcher
Merge branch '2.3' into 2.4

* 2.3:
  added missing @deprecated tag
  Fixed recursion level incrementing in FlattenException::flattenArgs().
  [HttpKernel] fixed wrong reference in TraceableEventDispatcher

Conflicts:
	src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php