[keys] support shadowing keys in the KeyAccumulator

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index b177deaa414c78999ae8a90efa65cea038e5795c..5d59cd3e19ef74852fe1fd0f2a3be3416fd8a4a3 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -859,6 +859,8 @@ bool HeapObject::IsStringTable() const { return IsHashTable(); }
 
 bool HeapObject::IsStringSet() const { return IsHashTable(); }
 
+bool HeapObject::IsObjectHashSet() const { return IsHashTable(); }
+
 bool HeapObject::IsNormalizedMapCache() const {
   return NormalizedMapCache::IsNormalizedMapCache(this);
 }
@@ -3073,7 +3075,6 @@ int HashTable<Derived, Shape, Key>::FindEntry(Isolate* isolate, Key key) {
   return FindEntry(isolate, key, HashTable::Hash(key));
 }
 
-
 // Find entry for key otherwise return kNotFound.
 template <typename Derived, typename Shape, typename Key>
 int HashTable<Derived, Shape, Key>::FindEntry(Isolate* isolate, Key key,
@@ -3095,6 +3096,26 @@ int HashTable<Derived, Shape, Key>::FindEntry(Isolate* isolate, Key key,
   return kNotFound;
 }
 
+template <typename Derived, typename Shape, typename Key>
+bool HashTable<Derived, Shape, Key>::Has(Key key) {
+  return FindEntry(key) != kNotFound;
+}
+
+template <typename Derived, typename Shape, typename Key>
+bool HashTable<Derived, Shape, Key>::Has(Isolate* isolate, Key key) {
+  return FindEntry(isolate, key) != kNotFound;
+}
+
+bool ObjectHashSet::Has(Isolate* isolate, Handle<Object> key, int32_t hash) {
+  return FindEntry(isolate, key, hash) != kNotFound;
+}
+
+bool ObjectHashSet::Has(Isolate* isolate, Handle<Object> key) {
+  Object* hash = key->GetHash();
+  if (!hash->IsSmi()) return false;
+  return FindEntry(isolate, key, Smi::cast(hash)->value()) != kNotFound;
+}
+
 bool StringSetShape::IsMatch(String* key, Object* value) {
   return value->IsString() && key->Equals(String::cast(value));
 }
@@ -3191,6 +3212,7 @@ CAST_ACCESSOR(NameDictionary)
 CAST_ACCESSOR(NormalizedMapCache)
 CAST_ACCESSOR(Object)
 CAST_ACCESSOR(ObjectHashTable)
+CAST_ACCESSOR(ObjectHashSet)
 CAST_ACCESSOR(Oddball)
 CAST_ACCESSOR(OrderedHashMap)
 CAST_ACCESSOR(OrderedHashSet)