Work in progress: allow pause-on-exceptions to work in Object.observe callbacks

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index 7944d0e96370bd830373ca739612efcf33588d84..8657aaad813b85102c598f7c4257770b7ea2eadc 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -700,7 +700,7 @@ class Isolate {
   bool OptionalRescheduleException(bool is_bottom_call);
 
   // Push and pop a promise and the current try-catch handler.
-  void PushPromise(Handle<JSObject> promise);
+  void PushPromise(Handle<Object> promise);
   void PopPromise();
   Handle<Object> GetPromiseOnStackOnThrow();
 
@@ -1344,12 +1344,12 @@ class PromiseOnStack {
                  PromiseOnStack* prev)
       : handler_(handler), promise_(promise), prev_(prev) {}
   StackHandler* handler() { return handler_; }
-  Handle<JSObject> promise() { return promise_; }
+  Handle<Object> promise() { return promise_; }
   PromiseOnStack* prev() { return prev_; }
 
  private:
   StackHandler* handler_;
-  Handle<JSObject> promise_;
+  Handle<Object> promise_;
   PromiseOnStack* prev_;
 };