Re-land beginning Dart 2.0 test migration.

tests/lib_2/math/call_cmath_box_failure_path_test.dart

Index: tests/lib_2/math/call_cmath_box_failure_path_test.dart
diff --git a/tests/lib/math/call_cmath_box_failure_path_test.dart b/tests/lib_2/math/call_cmath_box_failure_path_test.dart
similarity index 81%
rename from tests/lib/math/call_cmath_box_failure_path_test.dart
rename to tests/lib_2/math/call_cmath_box_failure_path_test.dart
index 9718489c823fe205f579aeb3c17ccc5862939936..bf634437379c5f1bd4853d4913ded7474048e00c 100644
--- a/tests/lib/math/call_cmath_box_failure_path_test.dart
+++ b/tests/lib_2/math/call_cmath_box_failure_path_test.dart
@@ -4,6 +4,9 @@
 
 // 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() {