Add corelib tests

test/codegen/corelib/double_round3_test.dart

Index: test/codegen/corelib/double_round3_test.dart
diff --git a/test/codegen/language/malbounded_type_literal_test.dart b/test/codegen/corelib/double_round3_test.dart
similarity index 55%
copy from test/codegen/language/malbounded_type_literal_test.dart
copy to test/codegen/corelib/double_round3_test.dart
index ca64d7efa8b66168b1bb82207f864ee87d467797..55646405499aec0805e917b444197a8750d133cb 100644
--- a/test/codegen/language/malbounded_type_literal_test.dart
+++ b/test/codegen/corelib/double_round3_test.dart
@@ -4,11 +4,9 @@
 
 import 'package:expect/expect.dart';
 
-class Super<T extends num> {}
-class Malbounded extends Super<String> {}
-
 main() {
-  Type t = Malbounded;
-  Expect.isNotNull(t);
-  Expect.isTrue(t is Type);
-}
+  Expect.equals(0, 0.49999999999999994.round());
+  Expect.equals(0, (-0.49999999999999994).round());
+  Expect.isTrue(0.49999999999999994.round() is int);
+  Expect.isTrue((-0.49999999999999994).round() is int);
+}