Fix compiler warnings on Win64.

test/cctest/test-types.cc

 // Copyright 2013 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 55 matching lines @@
     SmiConstant = Type::Constant(smi, region);
     Signed32Constant = Type::Constant(signed32, region);
     ObjectConstant1 = Type::Constant(object1, region);
     ObjectConstant2 = Type::Constant(object2, region);
     ArrayConstant = Type::Constant(array, region);
     for (ValueVector::iterator it = values.begin(); it != values.end(); ++it) {
       types.push_back(Type::Constant(*it, region));
     }
 
     while (types.size() < kMaxTypes) {
-      size_t i = rng.NextInt(types.size());
-      size_t j = rng.NextInt(types.size());
+      size_t i = rng.NextInt(static_cast<int>(types.size()));
+      size_t j = rng.NextInt(static_cast<int>(types.size()));
       if (i != j) types.push_back(Type::Union(types[i], types[j], region));
     }
   }
 
   RandomNumberGenerator rng;
 
   #define DECLARE_TYPE(name, value) TypeHandle name;
   BITSET_TYPE_LIST(DECLARE_TYPE)
   #undef DECLARE_TYPE
 
@@ skipping 978 matching lines @@
   ZoneTests().Intersect();
   HeapTests().Intersect();
 }
 
 
 TEST(Convert) {
   CcTest::InitializeVM();
   ZoneTests().Convert<HeapType, Handle<HeapType>, Isolate, HeapRep>();
   HeapTests().Convert<Type, Type*, Zone, ZoneRep>();
 }