[turbofan] Fix representation change from bit to tagged pointer.

test/mjsunit/compiler/regress-673244.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() {
+  var accumulator = false;
+  for (var i = 0; i < 4; i++) {
+    accumulator = accumulator.hasOwnProperty(3);
+    if (i === 1) %OptimizeOsr();
+  }
+}
+
+f();