Simplify v8/Isolate teardown.

src/mksnapshot.cc

 // Copyright 2006-2008 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 253 matching lines @@
   fprintf(stderr, "%s\n", *message_line);
   for (int i = 0; i <= message->GetEndColumn(); ++i) {
     fprintf(stderr, "%c", i < message->GetStartColumn() ? ' ' : '^');
   }
   fprintf(stderr, "\n");
 }
 
 
 int main(int argc, char** argv) {
   V8::InitializeICU();
+  // TODO(svenpanne) We can't do this here currently, although we should!
+  // v8::V8::Initialize();
   i::Isolate::SetCrashIfDefaultIsolateInitialized();
 
   // By default, log code create information in the snapshot.
   i::FLAG_log_code = true;
 
 #if V8_TARGET_ARCH_ARM
   // Printing flags on ARM requires knowing if we intend to enable
   // the serializer or not.
   v8::internal::CpuFeatures::SetHintCreatingSnapshot();
 #endif
@@ skipping 119 matching lines @@
   sink.WriteSpaceUsed(
       "",
       ser.CurrentAllocationAddress(i::NEW_SPACE),
       ser.CurrentAllocationAddress(i::OLD_POINTER_SPACE),
       ser.CurrentAllocationAddress(i::OLD_DATA_SPACE),
       ser.CurrentAllocationAddress(i::CODE_SPACE),
       ser.CurrentAllocationAddress(i::MAP_SPACE),
       ser.CurrentAllocationAddress(i::CELL_SPACE),
       ser.CurrentAllocationAddress(i::PROPERTY_CELL_SPACE));
   isolate->Exit();
+  i::Serializer::TearDown();
   isolate->Dispose();
   V8::Dispose();
   return 0;
 }