Merge branch '3.4' into 4.0

* 3.4:
  SCA with Php Inspections (EA Extended)
  Add test case for #25264
  Fixed the null value exception case.
  Remove rc/beta suffix from composer.json files
  Throw an exception is expression language is not installed
  Fail as early and noisily as possible
  [Console][DI] Fail gracefully
  [FrameworkBundle] Fix visibility of a test helper
  [link] clear the cache after linking
  [DI] Trigger deprecation when setting a to-be-private synthetic service
  [link] Prevent warnings when running link with 2.7
  [Validator] ExpressionValidator should use OBJECT_TO_STRING to allow value in message
  do not eagerly filter comment lines
  [WebProfilerBundle], [TwigBundle] Fix Profiler breaking XHTML pages (Content-Type: application/xhtml+xml)

Author: nicolas-grekas

Tests/Controller/RedirectControllerTest.php

@@ -252,7 +252,7 @@ private function createRedirectController($httpPort = null, $httpsPort = null)
         return new RedirectController(null, $httpPort, $httpsPort);
     }
 
-    public function assertRedirectUrl(Response $returnResponse, $expectedUrl)
+    private function assertRedirectUrl(Response $returnResponse, $expectedUrl)
     {
         $this->assertTrue($returnResponse->isRedirect($expectedUrl), "Expected: $expectedUrl\nGot:      ".$returnResponse->headers->get('Location'));
     }

composer.json

@@ -21,7 +21,7 @@
         "symfony/cache": "~3.4|~4.0",
         "symfony/dependency-injection": "~3.4|~4.0",
         "symfony/config": "~3.4|~4.0",
-        "symfony/event-dispatcher": "~3.4-beta4|~4.0-beta4",
+        "symfony/event-dispatcher": "~3.4|~4.0",
         "symfony/http-foundation": "~3.4|~4.0",
         "symfony/http-kernel": "~3.4|~4.0",
         "symfony/polyfill-mbstring": "~1.0",