Fix the return type of the date set methods.

src/runtime.cc

 // Copyright 2012 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 7564 matching lines @@
         time > DateCache::kMaxTimeInMs) {
       value = isolate->heap()->nan_value();
       is_value_nan = true;
     } else  {
       MaybeObject* maybe_result =
           isolate->heap()->AllocateHeapNumber(DoubleToInteger(time));
       if (!maybe_result->ToObject(&value)) return maybe_result;
     }
   }
   date->SetValue(value, is_value_nan);
-  return *date;
+  return value;
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_NewArgumentsFast) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 3);
 
   Handle<JSFunction> callee = args.at<JSFunction>(0);
   Object** parameters = reinterpret_cast<Object**>(args[1]);
   const int argument_count = Smi::cast(args[2])->value();
@@ skipping 5749 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal