[promises] Move PromiseHasUserDefinedRejectHandler to c++

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index 8bd3230c5183c36ab7486207a7d68e38085385cc..5d4c8ac1647ac63f862637e7afee918e0d97a621 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -105,8 +105,6 @@ enum ContextLookupFlags {
   V(PROMISE_CATCH_INDEX, JSFunction, promise_catch)                           \
   V(PROMISE_CREATE_INDEX, JSFunction, promise_create)                         \
   V(PROMISE_FUNCTION_INDEX, JSFunction, promise_function)                     \
-  V(PROMISE_HAS_USER_DEFINED_REJECT_HANDLER_INDEX, JSFunction,                \
-    promise_has_user_defined_reject_handler)                                  \
   V(PROMISE_DEBUG_GET_INFO_INDEX, JSFunction, promise_debug_get_info)         \
   V(PROMISE_REJECT_INDEX, JSFunction, promise_reject)                         \
   V(PROMISE_INTERNAL_REJECT_INDEX, JSFunction, promise_internal_reject)       \