Silence another VS warning

src/types.h

 // 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 337 matching lines @@
   static bool is_tagged(Type* type) { return !is_bitset(type); }
   static bool is_class(Type* type) { return is(type, kClassTag); }
   static bool is_constant(Type* type) { return is(type, kConstantTag); }
   static bool is_union(Type* type) { return is(type, kUnionTag); }
   static bool tagged_is_union(Tagged* tagged) {
     return is(from_tagged(tagged), kUnionTag);
   }
 
   static int as_bitset(Type* type) {
     ASSERT(is_bitset(type));
-    return reinterpret_cast<intptr_t>(type) >> 1;
+    return static_cast<int>(reinterpret_cast<intptr_t>(type) >> 1);
   }
   static Tagged* as_tagged(Type* type) {
     ASSERT(is_tagged(type));
     return reinterpret_cast<Tagged*>(type);
   }
   static i::Handle<i::Map> as_class(Type* type) {
     ASSERT(is_class(type));
     return i::Handle<i::Map>(tagged_get<i::Map**>(as_tagged(type), 0));
   }
   static i::Handle<i::Object> as_constant(Type* type) {
@@ skipping 181 matching lines @@
   }
 };
 
 typedef BoundsImpl<ZoneTypeConfig> ZoneBounds;
 typedef BoundsImpl<HeapTypeConfig> Bounds;
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPES_H_