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

src/i18n.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.
 
 // ECMAScript 402 API implementation.
 
 /**
  * Intl object is a single object that has some named properties,
  * all of which are constructors.
  */
@@ skipping 36 matching lines @@
   IsNaN = from.IsNaN;
   MathFloor = from.MathFloor;
   RegExpTest = from.RegExpTest;
   StringIndexOf = from.StringIndexOf;
   StringLastIndexOf = from.StringLastIndexOf;
   StringMatch = from.StringMatch;
   StringReplace = from.StringReplace;
   StringSplit = from.StringSplit;
   StringSubstr = from.StringSubstr;
   StringSubstring = from.StringSubstring;
-  ToNumber = from.ToNumber;
 });
 
 // -------------------------------------------------------------------
 
 var Intl = {};
 
 %AddNamedProperty(global, "Intl", Intl, DONT_ENUM);
 
 /**
  * Caches available locales for each service.
@@ skipping 1203 matching lines @@
 %SetNativeFlag(Intl.NumberFormat.supportedLocalesOf);
 
 
 /**
  * Returns a String value representing the result of calling ToNumber(value)
  * according to the effective locale and the formatting options of this
  * NumberFormat.
  */
 function formatNumber(formatter, value) {
   // Spec treats -0 and +0 as 0.
-  var number = ToNumber(value) + 0;
+  var number = TO_NUMBER(value) + 0;
 
   return %InternalNumberFormat(%GetImplFromInitializedIntlObject(formatter),
                                number);
 }
 
 
 /**
  * Returns a Number that represents string value that was passed in.
  */
 function parseNumber(formatter, value) {
@@ skipping 404 matching lines @@
 /**
  * Returns a String value representing the result of calling ToNumber(date)
  * according to the effective locale and the formatting options of this
  * DateTimeFormat.
  */
 function formatDate(formatter, dateValue) {
   var dateMs;
   if (IS_UNDEFINED(dateValue)) {
     dateMs = %DateCurrentTime();
   } else {
-    dateMs = ToNumber(dateValue);
+    dateMs = TO_NUMBER(dateValue);
   }
 
   if (!IsFinite(dateMs)) throw MakeRangeError(kDateRange);
 
   return %InternalDateFormat(%GetImplFromInitializedIntlObject(formatter),
                              new GlobalDate(dateMs));
 }
 
 
 /**
@@ skipping 393 matching lines @@
     }
 
     var locales = %_Arguments(0);
     var options = %_Arguments(1);
     return toLocaleDateTime(
         this, locales, options, 'time', 'time', 'dateformattime');
   }
 );
 
 })