remove HHVM code

Author: nicolas-grekas

src/Symfony/Component/VarDumper/Tests/Caster/SplCasterTest.php

@@ -166,9 +166,6 @@ public function testCastObjectStorageDumpsInfo()
 
     public function testCastArrayObject()
     {
-        if (\defined('HHVM_VERSION')) {
-            $this->markTestSkipped('HHVM as different internal details.');
-        }
         $var = new \ArrayObject(array(123));
         $var->foo = 234;
 
@@ -188,9 +185,6 @@ public function testCastArrayObject()
 
     public function testArrayIterator()
     {
-        if (\defined('HHVM_VERSION')) {
-            $this->markTestSkipped('HHVM as different internal details.');
-        }
         $var = new MyArrayIterator(array(234));
 
         $expected = <<<EOTXT