[ESnext] Implement Object Rest

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 7260a1eef4ce1d1954128c6c4c92108ff843aa37..551f12c84c94794357186ef6b41f59203c44fd04 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2008,11 +2008,13 @@ 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);
+      Arguments* 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);