Revert two Kernel changes that were causing test failures.

tests/language_strong/async_or_generator_return_type_stacktrace_test.dart

Index: tests/language_strong/async_or_generator_return_type_stacktrace_test.dart
diff --git a/tests/language_strong/async_or_generator_return_type_stacktrace_test.dart b/tests/language_strong/async_or_generator_return_type_stacktrace_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..272e11045c4119c0111d512200eb9e55a3055693
--- /dev/null
+++ b/tests/language_strong/async_or_generator_return_type_stacktrace_test.dart
@@ -0,0 +1,35 @@
+// Copyright (c) 2015, 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.
+
+import "package:expect/expect.dart";
+
+void badReturnTypeAsync() async {} // //# 01: static type warning
+void badReturnTypeAsyncStar() async* {} // //# 02: static type warning
+void badReturnTypeSyncStar() sync* {} // //# 03: static type warning
+
+main() {
+  try {
+    badReturnTypeAsync(); // //# 01: continued
+  } catch (e, st) {
+    Expect.isTrue(e is TypeError, "wrong exception type");
+    Expect.isTrue(
+        st.toString().contains("badReturnTypeAsync"), "missing frame");
+  }
+
+  try {
+    badReturnTypeAsyncStar(); // //# 02: continued
+  } catch (e, st) {
+    Expect.isTrue(e is TypeError, "wrong exception type");
+    Expect.isTrue(
+        st.toString().contains("badReturnTypeAsyncStar"), "missing frame");
+  }
+
+  try {
+    badReturnTypeSyncStar(); // //# 03: continued
+  } catch (e, st) {
+    Expect.isTrue(e is TypeError, "wrong exception type");
+    Expect.isTrue(
+        st.toString().contains("badReturnTypeSyncStar"), "missing frame");
+  }
+}