Record the initial Map in the Store IC if it is not the same as the transitioned Map

src/ic.cc

Index: src/ic.cc
===================================================================
--- src/ic.cc	(revision 14298)
+++ src/ic.cc	(working copy)
@@ -1681,16 +1681,23 @@
 
   State ic_state = target()->ic_state();
   Handle<Map> receiver_map(receiver->map(), isolate());
+  MapHandleList target_receiver_maps;
   if (ic_state == UNINITIALIZED || ic_state == PREMONOMORPHIC) {
     // Optimistically assume that ICs that haven't reached the MONOMORPHIC state
     // yet will do so and stay there.
     Handle<Map> monomorphic_map = ComputeTransitionedMap(receiver, store_mode);
     store_mode = GetNonTransitioningStoreMode(store_mode);
-    return isolate()->stub_cache()->ComputeKeyedStoreElement(
-        monomorphic_map, strict_mode, store_mode);
+    if (*monomorphic_map != *receiver_map) {
+      target_receiver_maps.Add(receiver_map);
+      target_receiver_maps.Add(monomorphic_map);
+      return isolate()->stub_cache()->ComputeStoreElementPolymorphic(
+          &target_receiver_maps, store_mode, strict_mode);
+    } else {
+      return isolate()->stub_cache()->ComputeKeyedStoreElement(
+          monomorphic_map, strict_mode, store_mode);
+    }
   }
 
-  MapHandleList target_receiver_maps;
   target()->FindAllMaps(&target_receiver_maps);
   if (target_receiver_maps.length() == 0) {
     // In the case that there is a non-map-specific IC is installed (e.g. keyed