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

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 59fa038f8d9eccbec389f3698f7a1ae180fa6167..2cc0f80e4e3dff61656caf09dfbf7e3c632adb74 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1390,12 +1390,11 @@ bool Isolate::OptionalRescheduleException(bool is_bottom_call) {
 }
 
 
-void Isolate::PushPromise(Handle<JSObject> promise) {
+void Isolate::PushPromise(Handle<Object> promise) {
   ThreadLocalTop* tltop = thread_local_top();
   PromiseOnStack* prev = tltop->promise_on_stack_;
   StackHandler* handler = StackHandler::FromAddress(Isolate::handler(tltop));
-  Handle<JSObject> global_handle =
-      Handle<JSObject>::cast(global_handles()->Create(*promise));
+  Handle<Object> global_handle = global_handles()->Create(*promise);
   tltop->promise_on_stack_ = new PromiseOnStack(handler, global_handle, prev);
 }