[debug] use catch prediction flag for promise rejections.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index ffe01db18c23ef1c3e832970a3758bbe6c2b6dd7..ea8c0641cc1bdef8014242edb03bd1fcbd9c24fc 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -660,7 +660,7 @@ class Isolate {
   bool OptionalRescheduleException(bool is_bottom_call);
 
   // Push and pop a promise and the current try-catch handler.
-  void PushPromise(Handle<JSObject> promise, Handle<JSFunction> function);
+  void PushPromise(Handle<JSObject> promise);
   void PopPromise();
   Handle<Object> GetPromiseOnStackOnThrow();
 
@@ -1436,15 +1436,12 @@ class Isolate {
 
 class PromiseOnStack {
  public:
-  PromiseOnStack(Handle<JSFunction> function, Handle<JSObject> promise,
-                 PromiseOnStack* prev)
-      : function_(function), promise_(promise), prev_(prev) {}
-  Handle<JSFunction> function() { return function_; }
+  PromiseOnStack(Handle<JSObject> promise, PromiseOnStack* prev)
+      : promise_(promise), prev_(prev) {}
   Handle<JSObject> promise() { return promise_; }
   PromiseOnStack* prev() { return prev_; }
 
  private:
-  Handle<JSFunction> function_;
   Handle<JSObject> promise_;
   PromiseOnStack* prev_;
 };