Revert change to EquivalentTime in date.js. The checks that I've removed in t...

src/date-delay.js

 // Copyright 2006-2008 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 96 matching lines @@
 function EquivalentTime(t) {
   // The issue here is that some library calls don't work right for dates
   // that cannot be represented using a non-negative signed 32 bit integer
   // (measured in whole seconds based on the 1970 epoch).
   // We solve this by mapping the time to a year with same leap-year-ness
   // and same starting day for the year.  The ECMAscript specification says
   // we must do this, but for compatibility with other browsers, we use
   // the actual year if it is in the range 1970..2037
   if (t >= 0 && t <= 2.1e12) return t;
 
-  // We call the function from runtime.cc directly to avoid extra checks which
-  // are unneeded.
-  var day = %DateMakeDay(EquivalentYear(YEAR_FROM_TIME(t)),
-                         MONTH_FROM_TIME(t),
-                         DATE_FROM_TIME(t));
+  var day = MakeDay(EquivalentYear(YEAR_FROM_TIME(t)),
+                    MONTH_FROM_TIME(t),
+                    DATE_FROM_TIME(t));
   return MakeDate(day, TimeWithinDay(t));
 }
 
 
 // Because computing the DST offset is a pretty expensive operation
 // we keep a cache of last computed offset along with a time interval
 // where we know the cache is valid.
 var DST_offset_cache = {
   // Cached DST offset.
   offset: 0,
@@ skipping 992 matching lines @@
     "toGMTString", DateToGMTString,
     "toUTCString", DateToUTCString,
     "getYear", DateGetYear,
     "setYear", DateSetYear,
     "toISOString", DateToISOString,
     "toJSON", DateToJSON
   ));
 }
 
 SetupDate();