[Form] '@group benchmark' for form performance tests

src/Symfony/Bridge/Doctrine/Tests/Form/Type/EntityTypePerformanceTest.php

@@ -93,6 +93,8 @@ class EntityTypePerformanceTest extends FormPerformanceTestCase
     /**
      * This test case is realistic in collection forms where each
      * row contains the same entity field.
+     *
+     * @group benchmark
      */
     public function testCollapsedEntityField()
     {

src/Symfony/Component/Form/Tests/CompoundFormPerformanceTest.php

@@ -18,6 +18,8 @@ class CompoundFormPerformanceTest extends FormPerformanceTestCase
 {
     /**
      * Create a compound form multiple times, as happens in a collection form
+     *
+     * @group benchmark
      */
     public function testArrayBasedForm()
     {

src/Symfony/Component/Form/Tests/Extension/Core/Type/ChoiceTypePerformanceTest.php

@@ -21,6 +21,8 @@ class ChoiceTypePerformanceTest extends FormPerformanceTestCase
     /**
      * This test case is realistic in collection forms where each
      * row contains the same choice field.
+     *
+     * @group benchmark
      */
     public function testSameChoiceFieldCreatedMultipleTimes()
     {