Fix dartium build by fixing SIMD tests.

runtime/tests/vm/dart/simd128float32_array_test.dart

Index: runtime/tests/vm/dart/simd128float32_array_test.dart
diff --git a/runtime/tests/vm/dart/simd128float32_array_test.dart b/runtime/tests/vm/dart/simd128float32_array_test.dart
index 54616e6138c19cb1474c8ec1b1a7e0fdc52120fb..44f4591c7c90e70fbe9c59b05adb8af895eaf65d 100644
--- a/runtime/tests/vm/dart/simd128float32_array_test.dart
+++ b/runtime/tests/vm/dart/simd128float32_array_test.dart
@@ -2,6 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// Library tag to be able to run in html test framework.
+library simd128float32_array_test;
+
 import 'dart:scalarlist';
 
 testLoadStore(array) {
@@ -60,4 +63,4 @@ main() {
   for (int i = 0; i < 3000; i++) {
     testLoadStore(list);
   }
-}
+}