Move tests out of corelib into scalarlist

tests/lib/scalarlist/float32x4_list_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 float32x4_list_test;
 
 import 'dart:scalarlist';
 
 testLoadStore(array) {
@@ skipping 46 matching lines @@
     floatList[i] = i.toDouble();
   }
   list = new Float32x4List.view(floatList.asByteArray());
   for (int i = 0; i < 3000; i++) {
     testView(list);
   }
   for (int i = 0; i < 3000; i++) {
     testLoadStore(list);
   }
 }