Fix GC hazard.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 8c1bdab1f02eed6bf5b2ff98606a22031740e82e..11f5398bd62136de8a84d24bc8a9993ae16edd1f 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -2441,10 +2441,10 @@ MaybeObject* JSObject::SetPropertyForResult(LookupResult* result,
                 "no_setter_in_callback", HandleVector(args, ARRAY_SIZE(args)));
             return isolate->Throw(*error);
           }
-          // The proxy does not define the property as an accessor.
-          // Consequently, it has no effect on setting the receiver.
-          return self->AddProperty(*hname, *hvalue, attributes, strict_mode);
         }
+        // The proxy does not define the property as an accessor.
+        // Consequently, it has no effect on setting the receiver.
+        return self->AddProperty(*hname, *hvalue, attributes, strict_mode);
       }
     }
   }