Revert of [stubs] Fix AccessorInfo mixup in KeyedStoreGeneric

test/mjsunit/regress/regress-crbug-668101.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
-
-function f(a, i, v) {
-  a[i] = v;
-}
-
-f("make it generic", 0, 0);
-
-var a = new Array(3);
-// Fast properties.
-f(a, "length", 2);
-assertEquals(2, a.length);
-
-// Dictionary properties.
-%OptimizeObjectForAddingMultipleProperties(a, 1);
-f(a, "length", 1);
-assertEquals(1, a.length);