VM: Fix bug in deferred loading.

tests/language/regress_28278_test.dart

+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// 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=--load-deferred-eagerly
+// VMOptions=
+
+import "package:expect/expect.dart";
+
+import "regress_28278_lib.dart" deferred as def;
+
+class D {
+  m() async {
+    await def.loadLibrary();
+    def.foo(print("here"));

[hausner, 2017/01/05 21:50:44]

Can you make the test self-checking, e.g. by concatenating the strings in a
trace that can be compared to an expected value?

[Florian Schneider, 2017/01/05 22:07:16]

Done.

+  }
+
+}
+
+main(args) async {
+  var d = new D();
+  await d.m();
+  await d.m();
+}
+