Revert of [turbofan] Properly handle dictionary maps in the prototype chain.

test/mjsunit/regress/regress-crbug-616709.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
-
-// Make the Object prototype have dictionary properties.
-for (var i = 0; i < 2000; i++) {
-  Object.prototype['X'+i] = true;
-}
-
-function boom(a1) {
-  return a1[0];
-}
-
-var a = new Array(1);
-a[0] = 0.1;
-boom(a);
-boom(a);
-%OptimizeFunctionOnNextCall(boom);
-boom(a);