Add flag to always call DebugBreak on abort

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index 5600542ba031e8ee02eabc7947080450f3111b93..2801b711bf7afc73dd1040938e53aff67aab6e6d 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -961,11 +961,11 @@ void OS::Sleep(int 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();
   }
 }