[keyed-store-generic] Update protectors if needed

test/mjsunit/keyed-store-generic.js

+// Copyright 2017 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 --no-stress-opt
+
+function f(a, i, v) { a[i] = v; }
+f("make it generic", 0, 0);
+
+(function TestIsConcatSpreadableProtector() {
+  var o = {length: 1, '0': 99};
+  %OptimizeObjectForAddingMultipleProperties(o, 0);
+  f(o, Symbol.isConcatSpreadable, true);
+  assertEquals([99], [].concat(o));
+})();
+
+(function TestSpeciesProtector() {
+  function MyArray() {}
+  assertTrue(%SpeciesProtector());
+  f(Array.prototype, "constructor", MyArray);
+  assertFalse(%SpeciesProtector());
+})();