[ic] Support data handlers that represent loads from prototypes.

src/ic/ic.h

Index: src/ic/ic.h
diff --git a/src/ic/ic.h b/src/ic/ic.h
index dbeefb53d4e2609a360a0015e8a321703ee95e57..a854ee5bc95fe8ab1a85b7855bd9118bceec58be 100644
--- a/src/ic/ic.h
+++ b/src/ic/ic.h
@@ -310,6 +310,9 @@ class LoadIC : public IC {
 
  private:
   Handle<Object> SimpleFieldLoad(FieldIndex index);
+  Handle<Object> SimpleFieldLoadFromPrototype(FieldIndex index,
+                                              Handle<Map> receiver_map,
+                                              Handle<JSObject> holder);
 
   friend class IC;
 };