[es6] Use the correct ToPrimitive in the Date Constructor.

src/macros.py

 # Copyright 2006-2009 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 21 matching lines @@
 define READ_ONLY   = 1;
 define DONT_ENUM   = 2;
 define DONT_DELETE = 4;
 define NEW_ONE_BYTE_STRING = true;
 define NEW_TWO_BYTE_STRING = false;
 
 # Constants used for getter and setter operations.
 define GETTER = 0;
 define SETTER = 1;
 
-define NO_HINT     = 0;
-define NUMBER_HINT = 1;
-define STRING_HINT = 2;
-
 # For date.js.
 define HoursPerDay      = 24;
 define MinutesPerHour   = 60;
 define SecondsPerMinute = 60;
 define msPerSecond      = 1000;
 define msPerMinute      = 60000;
 define msPerHour        = 3600000;
 define msPerDay         = 86400000;
 define msPerMonth       = 2592000000;
 
@@ skipping 251 matching lines @@
 define NOT_FOUND = -1;
 
 # Check whether debug is active.
 define DEBUG_IS_ACTIVE = (%_DebugIsActive() != 0);
 macro DEBUG_IS_STEPPING(function) = (%_DebugIsActive() != 0 && %DebugCallbackSupportsStepping(function));
 macro DEBUG_PREPARE_STEP_IN_IF_STEPPING(function) = if (DEBUG_IS_STEPPING(function)) %DebugPrepareStepInIfStepping(function);
 
 # SharedFlag equivalents
 define kNotShared = false;
 define kShared = true;