Re-land beginning Dart 2.0 test migration.

tests/lib_2/math/call_cmath_box_failure_path_test.dart

 // Copyright (c) 2016, 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.
 
 // VMOptions=--optimization-counter-threshold=-1 --new_gen_semi_max_size=2
 
+// TODO(rnystrom): This looks like a VM-specific test. Move out of
+// tests/language and into somewhere more appropriate.
+
 import 'dart:math';
 
 main() {
   // 2MB / 16 bytes = 125000 allocations
 
   for (var i = 0; i < 500000; i++) {
     sin(i);
   }
 
   for (var i = 0; i < 500000; i++) {
     cos(i);
   }
 
   for (var i = 0; i < 500000; i++) {
     i.toDouble().truncateToDouble();
   }
 }