Implement flag and source getters on RegExp.prototype.

src/js/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.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalObject = global.Object;
 var GlobalSymbol = global.Symbol;
 var hasInstanceSymbol = utils.ImportNow("has_instance_symbol");
 var isConcatSpreadableSymbol =
     utils.ImportNow("is_concat_spreadable_symbol");
-var isRegExpSymbol = utils.ImportNow("is_regexp_symbol");
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
 var MakeTypeError;
 var ObjectGetOwnPropertyKeys;
 var toPrimitiveSymbol = utils.ImportNow("to_primitive_symbol");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 var unscopablesSymbol = utils.ImportNow("unscopables_symbol");
 
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
   ObjectGetOwnPropertyKeys = from.ObjectGetOwnPropertyKeys;
@@ skipping 57 matching lines @@
 }
 
 // -------------------------------------------------------------------
 
 %FunctionSetPrototype(GlobalSymbol, new GlobalObject());
 
 utils.InstallConstants(GlobalSymbol, [
   // TODO(rossberg): expose when implemented.
   // "hasInstance", hasInstanceSymbol,
   // "isConcatSpreadable", isConcatSpreadableSymbol,
-  // "isRegExp", isRegExpSymbol,
   "iterator", iteratorSymbol,
   // TODO(yangguo): expose when implemented.
   // "match", matchSymbol,
   // "replace", replaceSymbol,
   // "search", searchSymbol,
   // "split, splitSymbol,
   "toPrimitive", toPrimitiveSymbol,
   // TODO(dslomov, caitp): Currently defined in harmony-tostring.js ---
   // Move here when shipping
   // "toStringTag", toStringTagSymbol,
@@ skipping 24 matching lines @@
 ]);
 
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.SymbolToString = SymbolToString;
 })
 
 })