[ESnext] Implement Object Rest

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 37016da8916aa86db6ae03b743334d1c47bfc4e4..77bc06430c7f4730b27412dd56742a9f6354b31a 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1997,11 +1997,14 @@ class JSReceiver: public HeapObject {
   MUST_USE_RESULT static Maybe<bool> HasInPrototypeChain(
       Isolate* isolate, Handle<JSReceiver> object, Handle<Object> proto);
 
-  // Reads all enumerable own properties of source and adds them to target,
-  // using either Set or CreateDataProperty depending on the use_set argument.
+  // Reads all enumerable own properties of source and adds them to
+  // target, using either Set or CreateDataProperty depending on the
+  // use_set argument. This only copies values not present in the
+  // maybe_excluded_properties list.
   MUST_USE_RESULT static Maybe<bool> SetOrCopyDataProperties(
       Isolate* isolate, Handle<JSReceiver> target, Handle<Object> source,
-      bool use_set);
+      const ScopedVector<Handle<Name>>* excluded_properties = nullptr,
+      bool use_set = true);
 
   // Implementation of [[HasProperty]], ECMA-262 5th edition, section 8.12.6.
   MUST_USE_RESULT static Maybe<bool> HasProperty(LookupIterator* it);