Trigger exception debug event for promises at the throw site.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index b3a20785f6776c927dc9da8cb8dcf4b4aecb847a..72df9b4b2b131794190e025049fe65f4e8e51362 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1031,8 +1031,7 @@ void Isolate::DoThrow(Object* exception, MessageLocation* location) {
 
   // Notify debugger of exception.
   if (catchable_by_javascript) {
-    debugger_->OnException(
-        exception_handle, report_exception, factory()->undefined_value());
+    debugger_->OnException(exception_handle, report_exception);
   }
 
   // Generate the message if required.