[promises] Fix .arguments on builtin function.

test/mjsunit/regress/regress-682349.js

Index: test/mjsunit/regress/regress-682349.js
diff --git a/test/mjsunit/regress/regress-682349.js b/test/mjsunit/regress/regress-682349.js
new file mode 100644
index 0000000000000000000000000000000000000000..162774fa0bd34ea64a881e915b786ef46f5b4237
--- /dev/null
+++ b/test/mjsunit/regress/regress-682349.js
@@ -0,0 +1,13 @@
+// Copyright 2017 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: --allow-natives-syntax
+
+let success = false;
+function f() {
+  success = (f.caller.arguments === null);
+}
+Promise.resolve().then(f);
+%RunMicrotasks();
+assertTrue(success);