Even better stack chains with VM async/await.

test/frame_test.dart

Index: test/frame_test.dart
diff --git a/test/frame_test.dart b/test/frame_test.dart
index 638d1d7f6e75472fddb7c45e80eb43842820400d..c2cb80e949a68afa68f0e1ed5641e57a5c7901fe 100644
--- a/test/frame_test.dart
+++ b/test/frame_test.dart
@@ -56,9 +56,9 @@ void main() {
       expect(frame.member, equals('Foo.<async>'));
     });
 
-    test('converts "<<anonymous closure>_async_body>" to "<async>"', () {
+    test('converts "<function_name_async_body>" to "<async>"', () {
       var frame = new Frame.parseVM(
-          '#0 Foo.<<anonymous closure>_async_body> (foo:0:0)');
+          '#0 Foo.<function_name_async_body> (foo:0:0)');
       expect(frame.member, equals('Foo.<async>'));
     });