Replace HeapType with a non-templated FieldType class.

src/lookup.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 "src/lookup.h"
 
 #include "src/bootstrapper.h"
 #include "src/deoptimizer.h"
 #include "src/elements.h"
 #include "src/isolate-inl.h"
@@ skipping 458 matching lines @@
   DCHECK(has_property_);
   DCHECK(!holder_map_->is_dictionary_map());
   DCHECK_EQ(v8::internal::DATA, property_details_.type());
   DCHECK(!IsElement());
   int index =
       holder_map_->instance_descriptors()->GetFieldIndex(descriptor_number());
   bool is_double = representation().IsDouble();
   return FieldIndex::ForPropertyIndex(*holder_map_, index, is_double);
 }
 
-
-Handle<HeapType> LookupIterator::GetFieldType() const {
+Handle<FieldType> LookupIterator::GetFieldType() const {
   DCHECK(has_property_);
   DCHECK(!holder_map_->is_dictionary_map());
   DCHECK_EQ(v8::internal::DATA, property_details_.type());
   return handle(
       holder_map_->instance_descriptors()->GetFieldType(descriptor_number()),
       isolate_);
 }
 
 
 Handle<PropertyCell> LookupIterator::GetPropertyCell() const {
@@ skipping 220 matching lines @@
     // Fall through.
     default:
       return NOT_FOUND;
   }
   UNREACHABLE();
   return state_;
 }
 
 }  // namespace internal
 }  // namespace v8