[runtime] [proxy] Fix Object.prototype.propertyIsEnumerable to support proxies

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index 26a55ac75b36489e84028946e265318abce52fbb..6bb9bd5d9216d1d61036f0dc7baad0c6f810a7b1 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -750,13 +750,13 @@ RUNTIME_FUNCTION(Runtime_IsPropertyEnumerable) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
 
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
   CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
 
   Maybe<PropertyAttributes> maybe =
       JSReceiver::GetOwnPropertyAttributes(object, key);
   if (!maybe.IsJust()) return isolate->heap()->exception();
-  if (maybe.FromJust() == ABSENT) maybe = Just(DONT_ENUM);
+  if (maybe.FromJust() == ABSENT) return isolate->heap()->false_value();
   return isolate->heap()->ToBoolean((maybe.FromJust() & DONT_ENUM) == 0);
 }