Some new/fixed async tests

test/mjsunit/es6/debug-promises/async-task-event.js

Index: test/mjsunit/es6/debug-promises/async-task-event.js
diff --git a/test/mjsunit/es6/debug-promises/async-task-event.js b/test/mjsunit/es6/debug-promises/async-task-event.js
index 88030a2e73c93d6d02fe26052c7a783df4bf49c9..0b0fa1e64f1509154a494fa58fe72839cd90e3df 100644
--- a/test/mjsunit/es6/debug-promises/async-task-event.js
+++ b/test/mjsunit/es6/debug-promises/async-task-event.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --expose-debug-as debug
+// Flags: --expose-debug-as debug --allow-natives-syntax
 
 Debug = debug.Debug;
 
@@ -16,8 +16,8 @@ var expected = [
   "didHandle #1",
   "willHandle #2",
   "then #2",
-  "enqueue #3",
   "didHandle #2",
+  "enqueue #3",
   "willHandle #3",
   "didHandle #3"
 ];
@@ -58,4 +58,6 @@ p.then(function() {
 });
 resolver();
 
+%RunMicrotasks();
+
 assertNull(exception);