Allow externalizing strings in old pointer space.

src/objects-inl.h

 // 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 3175 matching lines @@
 void ExternalAsciiString::update_data_cache() {
   if (is_short()) return;
   const char** data_field =
       reinterpret_cast<const char**>(FIELD_ADDR(this, kResourceDataOffset));
   *data_field = resource()->data();
 }
 
 
 void ExternalAsciiString::set_resource(
     const ExternalAsciiString::Resource* resource) {
+  ASSERT(IsAligned(reinterpret_cast<intptr_t>(resource), kPointerSize));
   *reinterpret_cast<const Resource**>(
       FIELD_ADDR(this, kResourceOffset)) = resource;
   if (resource != NULL) update_data_cache();
 }
 
 
 const uint8_t* ExternalAsciiString::GetChars() {
   return reinterpret_cast<const uint8_t*>(resource()->data());
 }
 
@@ skipping 3575 matching lines @@
 #undef READ_UINT32_FIELD
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_