[date] Date parser says true even for wrong dates, check twice.

src/date.cc

 // 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.
 
 #include "src/date.h"
 
 #include "src/objects.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
@@ skipping 53 matching lines @@
       *day = new_day;
       return;
     }
   }
   int save_days = days;
 
   days += kDaysOffset;
   *year = 400 * (days / kDaysIn400Years) - kYearsOffset;
   days %= kDaysIn400Years;
 
-  DCHECK(DaysFromYearMonth(*year, 0) + days == save_days);
+  DCHECK_EQ(save_days, DaysFromYearMonth(*year, 0) + days);
 
   days--;
   int yd1 = days / kDaysIn100Years;
   days %= kDaysIn100Years;
   *year += 100 * yd1;
 
   days++;
   int yd2 = days / kDaysIn4Years;
   days %= kDaysIn4Years;
   *year += 4 * yd2;
@@ skipping 281 matching lines @@
     if (result == NULL || result->last_used > dst_[i].last_used) {
       result = &dst_[i];
     }
   }
   ClearSegment(result);
   return result;
 }
 
 }  // namespace internal
 }  // namespace v8