Merge branch '2.7' into 2.8

* 2.7:
  Remove function_exists(__phpunit_run_isolated_test) checks

Author: nicolas-grekas

src/Symfony/Component/Debug/Tests/Fixtures/Throwing.php

@@ -1,5 +1,3 @@
 <?php
 
-if (!function_exists('__phpunit_run_isolated_test')) {
-    throw new \Exception('boo');
-}
+throw new \Exception('boo');

src/Symfony/Component/DependencyInjection/Tests/Compiler/OptionalServiceClass.php

@@ -13,8 +13,6 @@
 
 use Symfony\Bug\NotExistClass;
 
-if (!function_exists('__phpunit_run_isolated_test')) {
-    class OptionalServiceClass extends NotExistClass
-    {
-    }
+class OptionalServiceClass extends NotExistClass
+{
 }

src/Symfony/Component/Routing/Tests/Fixtures/validresource.php

@@ -1,8 +1,5 @@
 <?php
 
-if (function_exists('__phpunit_run_isolated_test')) {
-    return;
-}
 /** @var $loader \Symfony\Component\Routing\Loader\PhpFileLoader */
 /** @var \Symfony\Component\Routing\RouteCollection $collection */
 $collection = $loader->import('validpattern.php');