Implement implicit instance checks for API accessors.

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index 134ef8b843fbff585aa05ada077b5a919eca7a06..374d5154f80a073621f77f50fe768d8c92d4484e 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -993,6 +993,7 @@ void LoadIC::UpdateCaches(LookupResult* lookup,
         Handle<AccessorInfo> callback =
             Handle<AccessorInfo>::cast(callback_object);
         if (v8::ToCData<Address>(callback->getter()) == 0) return;
+        if (!callback->IsCompatibleReceiver(*receiver)) return;
         code = isolate()->stub_cache()->ComputeLoadCallback(
             name, receiver, holder, callback);
         break;
@@ -1256,6 +1257,7 @@ void KeyedLoadIC::UpdateCaches(LookupResult* lookup,
         Handle<AccessorInfo> callback =
             Handle<AccessorInfo>::cast(callback_object);
         if (v8::ToCData<Address>(callback->getter()) == 0) return;
+        if (!callback->IsCompatibleReceiver(*receiver)) return;
         code = isolate()->stub_cache()->ComputeKeyedLoadCallback(
             name, receiver, holder, callback);
         break;
@@ -1470,6 +1472,7 @@ void StoreIC::UpdateCaches(LookupResult* lookup,
       Handle<AccessorInfo> callback =
           Handle<AccessorInfo>::cast(callback_object);
       if (v8::ToCData<Address>(callback->setter()) == 0) return;
+      ASSERT(callback->IsCompatibleReceiver(*receiver));
       code = isolate()->stub_cache()->ComputeStoreCallback(
           name, receiver, callback, strict_mode);
       break;