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

src/platform.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
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   // Sleep for a number of milliseconds.
   static void Sleep(const int milliseconds);
 
   // Abort the current process.
   static void Abort();
 
   // Debug break.
   static void DebugBreak();
 
+  // Dump C++ current stack trace (only functional on Linux).
+  static void DumpBacktrace();
+
   // Walk the stack.
   static const int kStackWalkError = -1;
   static const int kStackWalkMaxNameLen = 256;
   static const int kStackWalkMaxTextLen = 256;
   struct StackFrame {
     void* address;
     char text[kStackWalkMaxTextLen];
   };
 
   static int StackWalk(Vector<StackFrame> frames);
@@ skipping 535 matching lines @@
   Atomic32 active_;
   PlatformData* data_;  // Platform specific data.
   int samples_taken_;  // Counts stack samples taken.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_