Add a integer static type cast to make MacOS compiler happy.

src/serialize.cc

 // Copyright 2006-2008 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 1239 matching lines @@
 
   if (type == CODE_TYPE) {
     Code* code = Code::cast(obj);
     // Ensure Code objects contain Object pointers, not Addresses.
     code->ConvertICTargetsFromAddressToObject();
     LOG(CodeMoveEvent(code->address(), addr));
   }
 
   // Write out the object prologue: type, size, and simulated address of obj.
   writer_->PutC('[');
-  CHECK_EQ(static_cast<intptr_t>(0), size & kObjectAlignmentMask);
+  CHECK_EQ(0, static_cast<int>(size & kObjectAlignmentMask));
   writer_->PutInt(type);
   writer_->PutInt(size >> kObjectAlignmentBits);
   PutEncodedAddress(addr);  // encodes AllocationSpace
 
   // Visit all the pointers in the object other than the map. This
   // will recursively serialize any as-yet-unvisited objects.
   obj->Iterate(this);
 
   // Mark end of recursively embedded objects, start of object body.
   writer_->PutC('|');
@@ skipping 410 matching lines @@
         ASSERT(index < large_objects_.length());
       }
       return large_objects_[index];  // s.page_offset() is ignored.
   }
   UNREACHABLE();
   return NULL;
 }
 
 
 } }  // namespace v8::internal