Allow uncacheable identifiers to go generic.

src/ic.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1701 matching lines @@
   if (LookupForWrite(receiver, name, value, &lookup, &state)) {
     if (FLAG_use_ic) {
       UpdateCaches(&lookup, state, strict_mode, receiver, name, value);
     }
   } else if (strict_mode == kStrictMode &&
              !(lookup.IsProperty() && lookup.IsReadOnly()) &&
              IsUndeclaredGlobal(object)) {
     // Strict mode doesn't allow setting non-existent global property.
     return ReferenceError("not_defined", name);
   } else if (FLAG_use_ic &&
-             (lookup.IsNormal() ||
+             (!name->IsCacheable(isolate()) ||
+              lookup.IsNormal() ||
               (lookup.IsField() && lookup.CanHoldValue(value)))) {
     Handle<Code> stub = strict_mode == kStrictMode
         ? generic_stub_strict() : generic_stub();
     set_target(*stub);
   }
 
   // Set the property.
   return JSReceiver::SetPropertyOrFail(
       receiver, name, value, NONE, strict_mode, store_mode);
 }
@@ skipping 1361 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal