Replace PushIfAbsent by a Stack object

test/mjsunit/json-stringify-stack.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.
+
+Object.defineProperty(Object.prototype, "length", {set() { throw "error" }});
+Object.defineProperty(Object.prototype, "values", {set() { throw "error" }});
+
+JSON.stringify({}, v=>v);