[v8-test262-automation] Changes from https://github.com/v8/v8.git at sha...

[v8-test262-automation] Changes from https://github.com/v8/v8.git at sha d2e0166d on Fri Sep 28 2018 18:33:38 GMT+0000 (Coordinated Universal Time)

implementation-contributed/v8/mjsunit/compiler/regress-890057.js

+// Copyright 2018 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
+
+function f() {}
+function g() {
+  f.prototype = undefined;
+  f();
+  new f();
+}
+
+// Do not use %OptimizeFunctionOnNextCall here, this particular bug needs
+// to trigger truly concurrent compilation.
+for (let i = 0; i < 10000; i++) g();