Add regression test for crbug.com/648740.

BUG=648740

Review-Url: https://codereview.chromium.org/2362563002
Cr-Commit-Position: refs/heads/master@{#39643}

test/mjsunit/regress/regress-crbug-648740.js

+// 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: --min-preparse-length=0
+
+(function () {
+  function foo() {
+    const arguments = 42;
+  }
+})()