Merge branch '4.4' into 5.4

* 4.4:
  [HttpClient] Fix the CS fix
  Workaround disabled "var_dump"
  [Serializer] Respect default context in DateTimeNormalizer::denormalize

# Conflicts:
#	src/Symfony/Component/Debug/ErrorHandler.php
#	src/Symfony/Component/HttpClient/HttpClientTrait.php
#	src/Symfony/Component/HttpKernel/EventListener/DebugHandlersListener.php

Author: ogizanagi

EventListener/DebugHandlersListener.php

@@ -57,7 +57,7 @@ public function __construct(callable $exceptionHandler = null, LoggerInterface $
             $deprecationLogger = $fileLinkFormat;
         }
 
-        $handler = set_exception_handler('var_dump');
+        $handler = set_exception_handler('is_int');
         $this->earlyHandler = \is_array($handler) ? $handler[0] : null;
         restore_exception_handler();
 
@@ -83,7 +83,7 @@ public function configure(object $event = null)
         }
         $this->firstCall = $this->hasTerminatedWithException = false;
 
-        $handler = set_exception_handler('var_dump');
+        $handler = set_exception_handler('is_int');
         $handler = \is_array($handler) ? $handler[0] : null;
         restore_exception_handler();