Object.observe: Fixed missing case for turning off ICs.

test/mjsunit/harmony/object-observe.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 305 matching lines @@
   { object: obj, name: "1", type: "updated", oldValue: 6 },
   { object: obj, name: "1", type: "reconfigured", oldValue: 8 },
   { object: obj, name: "1", type: "reconfigured", oldValue: 7 },
   // TODO(observe): oldValue should not be present below.
   { object: obj, name: "1", type: "deleted", oldValue: undefined },
   { object: obj, name: "1", type: "new" },
   // TODO(observe): oldValue should be absent below, and type = "reconfigured".
   { object: obj, name: "1", type: "updated", oldValue: undefined },
   { object: obj, name: "1", type: "updated", oldValue: 9 },
 ]);
+
+
+// Assignments in loops (checking different IC states).
+reset();
+var obj = {};
+Object.observe(obj, observer.callback);
+for (var i = 0; i < 5; i++) {
+  obj["a" + i] = i;
+}
+Object.deliverChangeRecords(observer.callback);
+observer.assertCallbackRecords([
+  { object: obj, name: "a0", type: "new" },
+  { object: obj, name: "a1", type: "new" },
+  { object: obj, name: "a2", type: "new" },
+  { object: obj, name: "a3", type: "new" },
+  { object: obj, name: "a4", type: "new" },
+]);
+
+reset();
+var obj = {};
+Object.observe(obj, observer.callback);
+for (var i = 0; i < 5; i++) {
+  obj[i] = i;
+}
+Object.deliverChangeRecords(observer.callback);
+observer.assertCallbackRecords([
+  { object: obj, name: "0", type: "new" },
+  { object: obj, name: "1", type: "new" },
+  { object: obj, name: "2", type: "new" },
+  { object: obj, name: "3", type: "new" },
+  { object: obj, name: "4", type: "new" },
+]);