[date] Refactor the %_DateField intrinsic to be optimizable.

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 175 matching lines @@
 # REGEXP_NUMBER_OF_CAPTURES
 macro NUMBER_OF_CAPTURES(array) = ((array)[0]);
 
 # Limit according to ECMA 262 15.9.1.1
 define MAX_TIME_MS = 8640000000000000;
 # Limit which is MAX_TIME_MS + msPerMonth.
 define MAX_TIME_BEFORE_UTC = 8640002592000000;
 
 # Gets the value of a Date object. If arg is not a Date object
 # a type error is thrown.
-macro CHECK_DATE(arg) = if (%_ClassOf(arg) !== 'Date') throw MakeTypeError(kDateType);
+macro CHECK_DATE(arg) = %_ThrowIfNotADate(arg);
 macro LOCAL_DATE_VALUE(arg) = (%_DateField(arg, 0) + %_DateField(arg, 21));
 macro UTC_DATE_VALUE(arg)    = (%_DateField(arg, 0));
 
 macro LOCAL_YEAR(arg)        = (%_DateField(arg, 1));
 macro LOCAL_MONTH(arg)       = (%_DateField(arg, 2));
 macro LOCAL_DAY(arg)         = (%_DateField(arg, 3));
 macro LOCAL_WEEKDAY(arg)     = (%_DateField(arg, 4));
 macro LOCAL_HOUR(arg)        = (%_DateField(arg, 5));
 macro LOCAL_MIN(arg)         = (%_DateField(arg, 6));
 macro LOCAL_SEC(arg)         = (%_DateField(arg, 7));
@@ skipping 99 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;