Fix dartium build by fixing SIMD tests.

runtime/tests/vm/dart/simd128float32_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // 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 simd128_float32_test;
+
 import 'dart:scalarlist';
 
 testAdd() {
   var m = new Float32x4(-1.0, -2.0, -3.0, -4.0);
   var n = new Float32x4(1.0, 2.0, 3.0, 4.0);
   var o = m + n;
   Expect.equals(0.0, o.x);
   Expect.equals(0.0, o.y);
   Expect.equals(0.0, o.z);
   Expect.equals(0.0, o.w);
@@ skipping 347 matching lines @@
     testComparison();
     testScale();
     testClamp();
     testAbs();
     testMin();
     testMax();
     testSqrt();
     testReciprocal();
     testReciprocalSqrt();
   }
-}
+}