[es6] Fix missing bits for full @@toPrimitive support.

src/regexp.js

 // Copyright 2012 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.
 
 var $regexpLastMatchInfoOverride;
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var FLAG_harmony_regexps;
 var FLAG_harmony_unicode_regexps;
 var GlobalRegExp = global.RegExp;
 var InternalPackedArray = utils.InternalPackedArray;
-var ToNumber;
-
-utils.Import(function(from) {
-  ToNumber = from.ToNumber;
-});
 
 utils.ImportFromExperimental(function(from) {
   FLAG_harmony_regexps = from.FLAG_harmony_regexps;
   FLAG_harmony_unicode_regexps = from.FLAG_harmony_unicode_regexps;
 });
 
 // -------------------------------------------------------------------
 
 // Property of the builtins object for recording the result of the last
 // regexp match.  The property RegExpLastMatchInfo includes the matchIndices
@@ skipping 421 matching lines @@
 // Exports
 
 utils.Export(function(to) {
   to.RegExpExec = DoRegExpExec;
   to.RegExpExecNoTests = RegExpExecNoTests;
   to.RegExpLastMatchInfo = RegExpLastMatchInfo;
   to.RegExpTest = RegExpTest;
 });
 
 })