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

composer.json

@@ -33,7 +33,7 @@
         "symfony/http-kernel": "~3.4|~4.0",
         "symfony/security-csrf": "~3.4|~4.0",
         "symfony/translation": "~3.4|~4.0",
-        "symfony/var-dumper": "~3.4-beta3|~4.0-beta3"
+        "symfony/var-dumper": "~3.4|~4.0"
     },
     "conflict": {
         "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",