Fix compile error on windows.

src/objects.h

 // 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 994 matching lines @@
   // Dispatched behavior.
   inline void SmiPrint() {
     SmiPrint(stdout);
   }
   void SmiPrint(FILE* out);
   void SmiPrint(StringStream* accumulator);
 #ifdef DEBUG
   void SmiVerify();
 #endif
 
-  static const int kMinValue = (-1U << (kSmiValueSize - 1));
+  static const int kMinValue = 
+      (static_cast<unsigned int>(-1)) << (kSmiValueSize - 1);
   static const int kMaxValue = -(kMinValue + 1);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Smi);
 };
 
 
 // Failure is used for reporting out of memory situations and
 // propagating exceptions through the runtime system.  Failure objects
 // are transient and cannot occur as part of the object graph.
@@ skipping 7276 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_