[runtime][ic] Constant field tracking support.

src/compiler/access-info.cc

 // Copyright 2015 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 <ostream>
 
 #include "src/accessors.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-info.h"
 #include "src/compiler/type-cache.h"
@@ skipping 332 matching lines @@
           return true;
         } else {
           DCHECK_EQ(kAccessor, details.kind());
           // TODO(turbofan): Add support for general accessors?
           return false;
         }
 
       } else {
         DCHECK_EQ(kDescriptor, details.location());
         if (details.kind() == kData) {
+          DCHECK(!FLAG_track_constant_fields);
           *access_info = PropertyAccessInfo::DataConstant(
               MapList{receiver_map},
               handle(descriptors->GetValue(number), isolate()), holder);
           return true;
         } else {
           DCHECK_EQ(kAccessor, details.kind());
           Handle<Object> accessors(descriptors->GetValue(number), isolate());
           if (!accessors->IsAccessorPair()) return false;
           Handle<Object> accessor(
               access_mode == AccessMode::kLoad
@@ skipping 206 matching lines @@
   }
   return false;
 }
 
 
 Factory* AccessInfoFactory::factory() const { return isolate()->factory(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8