[promises] Move PromiseHasUserDefinedRejectHandler to c++

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index b3b23662194415658b93c7dbbfad66ae7f24a728..44ba7428cc9930cdc6e3b8b02cab4f4d71e54906 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -8655,6 +8655,10 @@ class JSPromise : public JSObject {
   // [has_handler]: Whether this promise has a reject handler or not.
   DECL_BOOLEAN_ACCESSORS(has_handler)
 
+  // [handled_hint]: Whether this promise will be handled by a catch
+  // block in an async function.
+  DECL_BOOLEAN_ACCESSORS(handled_hint)
+
   static const char* Status(int status);
 
   DECLARE_CAST(JSPromise)
@@ -8675,6 +8679,7 @@ class JSPromise : public JSObject {
 
   // Flags layout.
   static const int kHasHandlerBit = 0;
+  static const int kHandledHintBit = 1;
 };
 
 // Regular expressions