Simplify v8/Isolate teardown.

src/serialize.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 767 matching lines @@
   ASSERT(NoBarrier_Load(&serialization_state_) ==
          SERIALIZER_STATE_UNINITIALIZED);
   SerializationState state = code_address_map_
       ? SERIALIZER_STATE_ENABLED
       : SERIALIZER_STATE_DISABLED;
   NoBarrier_Store(&serialization_state_, state);
 }
 
 
 void Serializer::TearDown() {
-  // TearDown is called by V8::TearDown() for the default isolate. It's safe
-  // to shut down the serializer by that point. Just to be safe, we restore
-  // serialization_state_ to uninitialized.
   ASSERT(NoBarrier_Load(&serialization_state_) !=
          SERIALIZER_STATE_UNINITIALIZED);
   if (code_address_map_) {
     ASSERT(NoBarrier_Load(&serialization_state_) ==
            SERIALIZER_STATE_ENABLED);
     delete code_address_map_;
     code_address_map_ = NULL;
   }
 
   NoBarrier_Store(&serialization_state_, SERIALIZER_STATE_UNINITIALIZED);
@@ skipping 1100 matching lines @@
 
 bool SnapshotByteSource::AtEOF() {
   if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false;
   for (int x = position_; x < length_; x++) {
     if (data_[x] != SerializerDeserializer::nop()) return false;
   }
   return true;
 }
 
 } }  // namespace v8::internal