Follow-up to #10312: Fixed minor performance related issues in Yaml\Inline.
Merge branch '2.3' into 2.4

* 2.3:
  bumped Symfony version to 2.3.12
  updated VERSION for 2.3.11
  update CONTRIBUTORS for 2.3.11
  updated CHANGELOG for 2.3.11
  Follow-up to #10312: Fixed minor performance related issues in Yaml\Inline.

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php