Partial rollback of Promise error checking

test/mjsunit/regress/regress-crbug-575314.js

+// Copyright 2014 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
+
+// https://code.google.com/p/chromium/issues/detail?id=575314
+
+// Overwriting the constructor of a Promise with something that doesn't have
+// @@species shouldn't result in a rejection, even if that constructor
+// is somewhat bogus.
+
+var test = new Promise(function(){});
+test.constructor = function(){};
+var exception;

[adamk, 2016/01/11 20:17:17]

This var looks unused?

[Dan Ehrenberg, 2016/01/11 20:19:40]

Fixed.

+Promise.resolve(test).catch(e => %AbortJS(e + " FAILED!"));