"Set up directories.." commit below broke the buildbot tests, two others are collateral damage.

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();
-  }
-}