Add corelib tests

test/codegen/corelib/date_time3_test.dart

Index: test/codegen/corelib/date_time3_test.dart
diff --git a/test/codegen/language/compile_time_constant9_test.dart b/test/codegen/corelib/date_time3_test.dart
similarity index 56%
copy from test/codegen/language/compile_time_constant9_test.dart
copy to test/codegen/corelib/date_time3_test.dart
index 96cf41a5dafb3588f8a376bfbdfefb4241b40bb9..557eedee15fde73a37da728fef633214dd6d2548 100644
--- a/test/codegen/language/compile_time_constant9_test.dart
+++ b/test/codegen/corelib/date_time3_test.dart
@@ -4,15 +4,11 @@
 
 import "package:expect/expect.dart";
 
-class B {
-  const B();
-}
-
-class A {
-  var x = const B();
-  A();
-}
+// At some point dart was emitting a bad padding 0 for Dates where the ms were
+// ending with 10.
 
 main() {
-  Expect.isTrue(identical(new A().x, new A().x));
+  String s = "2012-01-30 08:30:00.010";
+  DateTime d = DateTime.parse(s);
+  Expect.equals(s, d.toString());
 }