Treat FOREIGN_TYPE as internal.

src/types.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "types.h"
 
 #include "string-stream.h"
 #include "types-inl.h"
 
 namespace v8 {
@@ skipping 238 matching lines @@
       // we must exclude Undetectable here. This makes no sense, really,
       // because it means that the template isn't actually parametric.
       // Also, it doesn't apply elsewhere. 8-(
       // We ought to find a cleaner solution for compiling stubs parameterised
       // over type or class variables, esp ones with bounds...
       return kDetectable;
     case DECLARED_ACCESSOR_INFO_TYPE:
     case EXECUTABLE_ACCESSOR_INFO_TYPE:
     case ACCESSOR_PAIR_TYPE:
     case FIXED_ARRAY_TYPE:
+    case FOREIGN_TYPE:
       return kInternal & kTaggedPtr;
     default:
       UNREACHABLE();
       return kNone;
   }
 }
 
 
 // Most precise _current_ type of a value (usually its class).
 template<class Config>
@@ skipping 505 matching lines @@
 template class TypeImpl<HeapTypeConfig>::Iterator<i::Object>;
 
 template TypeImpl<ZoneTypeConfig>::TypeHandle
   TypeImpl<ZoneTypeConfig>::Convert<HeapType>(
     TypeImpl<HeapTypeConfig>::TypeHandle, TypeImpl<ZoneTypeConfig>::Region*);
 template TypeImpl<HeapTypeConfig>::TypeHandle
   TypeImpl<HeapTypeConfig>::Convert<Type>(
     TypeImpl<ZoneTypeConfig>::TypeHandle, TypeImpl<HeapTypeConfig>::Region*);
 
 } }  // namespace v8::internal