[runtime] Fancify KeyAccumulator

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 61247426495e9666410fb8fd2c4ba79131a8500b..5fe65802c63e6c278ff009108ec917c27ea11a47 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -286,6 +286,24 @@ bool Object::KeyEquals(Object* second) {
 }
 
 
+bool Object::FilterKey(PropertyAttributes filter) {
+  if ((filter & SYMBOLIC) && IsSymbol()) {
+    return true;
+  }
+
+  if ((filter & PRIVATE_SYMBOL) && IsSymbol() &&
+      Symbol::cast(this)->is_private()) {
+    return true;
+  }
+
+  if ((filter & STRING) && !IsSymbol()) {
+    return true;
+  }
+
+  return false;
+}
+
+
 Handle<Object> Object::NewStorageFor(Isolate* isolate,
                                      Handle<Object> object,
                                      Representation representation) {