[crankshaft] Don't inline array indexOf operations if receiver's proto is not a JSObject.

test/mjsunit/regress/regress-crbug-577112.js

-// Copyright 2015 the V8 project authors. All rights reserved.
+// 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
 
-var global = new Object(3);
+Array.prototype.__proto__ = null;
+var prototype = Array.prototype;
 function f() {
-  global[0] = global[0] >>> 15.5;
+  prototype.lastIndexOf({});
 }
-
 f();
 f();
 %OptimizeFunctionOnNextCall(f);
 f();