Don't clear exception pending message if we have externally TryCatch and finally on top of stack.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index bc7646bd4834bafc03bf333f53da14ee072ac451..963f5f53076fb89e3d89ede87315cd70c085acbc 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -606,6 +606,7 @@ class Isolate {
   }
 
   bool IsExternallyCaught();
+  bool IsFinallyOnTop();
 
   bool is_catchable_by_javascript(Object* exception) {
     return exception != heap()->termination_exception();
@@ -1178,7 +1179,7 @@ class Isolate {
 
   void FillCache();
 
-  void PropagatePendingExceptionToExternalTryCatch();
+  bool PropagatePendingExceptionToExternalTryCatch();
 
   void InitializeDebugger();