During arguments materialization, do not store materialized objects without lazy deopt.

test/mjsunit/regress/regress-arg-materialize-store.js

 // Copyright 2015 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 g() {
-  throw 0;
+function f() {
+  return f.arguments;
 }
 
-function f() {
-  g();
-  while (1) {}
+function g(deopt) {
+  var o = { x : 2 };
+  f();
+  o.x = 1;
+  deopt + 0;
+  return o.x;
 }
 
-assertThrows(function () { f(); });
+g(0);
+g(0);
+%OptimizeFunctionOnNextCall(g);
+assertEquals(1, g({}));