Load setter from map descriptor instead of embedding it in handler.

src/ic/ic.cc

Index: src/ic/ic.cc
diff --git a/src/ic/ic.cc b/src/ic/ic.cc
index 487a615f7155625f12d56feffce4bd32bf29fe3f..cc0459e65552715efab27e3afc620b7b0a6304b0 100644
--- a/src/ic/ic.cc
+++ b/src/ic/ic.cc
@@ -1732,8 +1732,10 @@ Handle<Code> StoreIC::CompileHandler(LookupIterator* lookup,
           return compiler.CompileStoreCallback(receiver, lookup->name(),
                                                call_optimization);
         }
+        int expected_arguments = function->shared()->formal_parameter_count();
         return compiler.CompileStoreViaSetter(receiver, lookup->name(),
-                                              Handle<JSFunction>::cast(setter));
+                                              lookup->GetAccessorIndex(),
+                                              expected_arguments);
       }
       break;
     }