Refactor ObjectGetOwnPropertyKeys to accept bitmask rather than boolean

src/symbol.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Array = global.Array;
 
@@ skipping 55 matching lines @@
   return %SymbolRegistry().keyFor[symbol];
 }
 
 
 // ES6 19.1.2.8
 function ObjectGetOwnPropertySymbols(obj) {
   obj = ToObject(obj);
 
   // TODO(arv): Proxies use a shared trap for String and Symbol keys.
 
-  return ObjectGetOwnPropertyKeys(obj, true);
+  return ObjectGetOwnPropertyKeys(obj, PROPERTY_ATTRIBUTES_STRING);
 }
 
 
 //-------------------------------------------------------------------
 
 var symbolHasInstance = InternalSymbol("Symbol.hasInstance");
 var symbolIsConcatSpreadable = InternalSymbol("Symbol.isConcatSpreadable");
 var symbolIsRegExp = InternalSymbol("Symbol.isRegExp");
 var symbolIterator = InternalSymbol("Symbol.iterator");
 var symbolToStringTag = InternalSymbol("Symbol.toStringTag");
@@ skipping 38 matching lines @@
 
 function ExtendObject() {
   %CheckIsBootstrapping();
 
   InstallFunctions($Object, DONT_ENUM, $Array(
     "getOwnPropertySymbols", ObjectGetOwnPropertySymbols
   ));
 }
 
 ExtendObject();