Merged: [compiler] Properly validate stable map assumption for globals.

test/mjsunit/regress/regress-crbug-659475-2.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: --allow-natives-syntax
+
+var n;
+
+function Ctor() {
+  try { } catch (e) {}
+  n = new Set();
+}
+
+function Check() {
+  n.xyz = 0x826852f4;
+}
+
+Ctor();
+Ctor();
+%OptimizeFunctionOnNextCall(Ctor);
+Ctor();
+
+Check();
+Check();
+%OptimizeFunctionOnNextCall(Check);
+Check();
+
+Ctor();
+Check();
+
+parseInt('AAAAAAAA');