[builtins] Refactor the remaining Date builtins.

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 19283 matching lines @@
     case kDaysUTC: return Smi::FromInt(days);
     case kTimeInDayUTC: return Smi::FromInt(time_in_day_ms);
     default: UNREACHABLE();
   }
 
   UNREACHABLE();
   return NULL;
 }
 
 
+// static
+Handle<Object> JSDate::SetValue(Handle<JSDate> date, double v) {
+  Isolate* const isolate = date->GetIsolate();
+  Handle<Object> value = isolate->factory()->NewNumber(v);
+  bool value_is_nan = std::isnan(v);
+  date->SetValue(*value, value_is_nan);
+  return value;
+}
+
+
 void JSDate::SetValue(Object* value, bool is_value_nan) {
   set_value(value);
   if (is_value_nan) {
     HeapNumber* nan = GetIsolate()->heap()->nan_value();
     set_cache_stamp(nan, SKIP_WRITE_BARRIER);
     set_year(nan, SKIP_WRITE_BARRIER);
     set_month(nan, SKIP_WRITE_BARRIER);
     set_day(nan, SKIP_WRITE_BARRIER);
     set_hour(nan, SKIP_WRITE_BARRIER);
     set_min(nan, SKIP_WRITE_BARRIER);
@@ skipping 294 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8