Add flag to always call DebugBreak on abort

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 943 matching lines @@
   VirtualProtect(address, size, PAGE_READONLY | PAGE_GUARD, &oldprotect);
 }
 
 
 void OS::Sleep(int milliseconds) {
   ::Sleep(milliseconds);
 }
 
 
 void OS::Abort() {
-  if (!IsDebuggerPresent()) {
+  if (IsDebuggerPresent() || FLAG_break_on_abort) {
+    DebugBreak();
+  } else {
     // Make the MSVCRT do a silent abort.
     raise(SIGABRT);
-  } else {
-    DebugBreak();
   }
 }
 
 
 void OS::DebugBreak() {
 #ifdef _MSC_VER
   __debugbreak();
 #else
   ::DebugBreak();
 #endif
@@ skipping 1110 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SamplerThread::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal