Merge branch '3.4' into 4.0

* 3.4:
  [HttpKernel] fix PHP 5.4 compat
  Fix surrogate not using original request
  [Finder] Update RealIteratorTestCase
  [Routing] remove unneeded dev dep on doctrine/common
  [minor] SCA
  [Validator] Remove BOM in some xlf files
  Fix #27378: Error when rendering a DateIntervalType form with exactly 0 weeks
  [HttpKernel] fix session tracking in surrogate master requests

Author: nicolas-grekas

composer.json

@@ -25,7 +25,6 @@
         "symfony/expression-language": "~3.4|~4.0",
         "symfony/dependency-injection": "~3.4|~4.0",
         "doctrine/annotations": "~1.0",
-        "doctrine/common": "~2.2",
         "psr/log": "~1.0"
     },
     "conflict": {