MAGETWO-65145: Performance degradation on front end on configurable products with huge amount of variation

Author: serhii-balko

app/code/Magento/ConfigurableProduct/Model/ResourceModel/Attribute/OptionSelectBuilder.php

@@ -126,4 +126,4 @@ public function getSelect(AbstractAttribute $superAttribute, int $productId, Sco
 
         return $select;
     }
-}
+}

app/code/Magento/ConfigurableProduct/Model/ResourceModel/Attribute/OptionSelectBuilderInterface.php

@@ -23,4 +23,4 @@ interface OptionSelectBuilderInterface
      * @return Select
      */
     public function getSelect(AbstractAttribute $superAttribute, int $productId, ScopeInterface $scope);
-}
+}

app/code/Magento/ConfigurableProduct/Test/Unit/Model/AttributeOptionProviderTest.php

@@ -15,7 +15,6 @@
 use Magento\Eav\Model\Entity\Attribute\AbstractAttribute;
 use Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable\Attribute;
 
-
 /**
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */

app/code/Magento/ConfigurableProduct/Test/Unit/Model/ResourceModel/Attribute/OptionSelectBuilderTest.php

@@ -58,8 +58,7 @@ class OptionSelectBuilderTest extends \PHPUnit_Framework_TestCase
      * @var ScopeInterface|\PHPUnit_Framework_MockObject_MockObject
      */
     private $scope;
-
-
+    
     protected function setUp()
     {
         $this->connectionMock = $this->getMockBuilder(AdapterInterface::class)