V8_Fatal now prints C++ stack trace in debug mode.

src/platform-win32.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 969 matching lines @@
 
 void OS::DebugBreak() {
 #ifdef _MSC_VER
   __debugbreak();
 #else
   ::DebugBreak();
 #endif
 }
 
 
+void OS::DumpBacktrace() {
+  // Currently unsupported.
+}
+
+
 class Win32MemoryMappedFile : public OS::MemoryMappedFile {
  public:
   Win32MemoryMappedFile(HANDLE file,
                         HANDLE file_mapping,
                         void* memory,
                         int size)
       : file_(file),
         file_mapping_(file_mapping),
         memory_(memory),
         size_(size) { }
@@ skipping 1120 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SamplerThread::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal