Fix for a GC-stress failures after r20987.

src/objects.cc

 // Copyright 2013 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 14509 matching lines @@
     MaybeHandle<Map> maybe_map =
         isolate->factory()->InternalizedStringMapForString(string_);
     Handle<Map> map;
     if (maybe_map.ToHandle(&map)) {
       string_->set_map_no_write_barrier(*map);
       ASSERT(string_->IsInternalizedString());
       return string_;
     }
     // Otherwise allocate a new internalized string.
     return isolate->factory()->NewInternalizedStringImpl(
-        *string_, string_->length(), string_->hash_field());
+        string_, string_->length(), string_->hash_field());
   }
 
   static uint32_t StringHash(Object* obj) {
     return String::cast(obj)->Hash();
   }
 
   Handle<String> string_;
 };
 
 
@@ skipping 2760 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal