Merge more Kernel infrastructure from kernel_sdk SDK fork.

tests/kernel/unsorted/string_concatenation_test.dart

Index: tests/kernel/unsorted/string_concatenation_test.dart
diff --git a/tests/standalone/fields_may_be_reset_test.dart b/tests/kernel/unsorted/string_concatenation_test.dart
similarity index 65%
copy from tests/standalone/fields_may_be_reset_test.dart
copy to tests/kernel/unsorted/string_concatenation_test.dart
index 3ab6fc62450cf34b84362d6af3c911dcf8c7327c..53eae4e96a472d4f80180a5ada01d05ee5a3c6af 100644
--- a/tests/standalone/fields_may_be_reset_test.dart
+++ b/tests/kernel/unsorted/string_concatenation_test.dart
@@ -2,8 +2,12 @@
 // 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=--fields_may_be_reset
+import 'expect.dart';
+
+class A {
+  toString() => 'hello';
+}
 
 main() {
-  print("Okay");
+  Expect.isTrue('begin ${new A()} end' == 'begin hello end');
 }