[interpreter] support async functions in Ignition

test/mjsunit/harmony/regress/regress-618603.js

Index: test/mjsunit/harmony/regress/regress-618603.js
diff --git a/test/mjsunit/harmony/regress/regress-618603.js b/test/mjsunit/harmony/regress/regress-618603.js
new file mode 100644
index 0000000000000000000000000000000000000000..7b23ef41960346b2ff6342603f1b40569de64458
--- /dev/null
+++ b/test/mjsunit/harmony/regress/regress-618603.js
@@ -0,0 +1,14 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-async-await --ignition-generators
+
+try {
+} catch(e) {; }
+function __f_7(expected, run) {
+  var __v_10 = run();
+};
+__f_7("[1,2,3]", () => (function() {
+      return (async () => {[...await arguments] })();
+      })());