Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

tests/kernel/unsorted/string_buffer_test.dart

Index: tests/kernel/unsorted/string_buffer_test.dart
diff --git a/tests/standalone/fields_may_be_reset_test.dart b/tests/kernel/unsorted/string_buffer_test.dart
similarity index 75%
copy from tests/standalone/fields_may_be_reset_test.dart
copy to tests/kernel/unsorted/string_buffer_test.dart
index 3ab6fc62450cf34b84362d6af3c911dcf8c7327c..a89aee66e2ffd6335e5ecec5d9dbd06c4ed46ced 100644
--- a/tests/standalone/fields_may_be_reset_test.dart
+++ b/tests/kernel/unsorted/string_buffer_test.dart
@@ -2,8 +2,8 @@
 // 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
-
 main() {
-  print("Okay");
+  var sb = new StringBuffer();
+  sb.writeln('hello world :)');
+  print(sb);
 }