[runtime][ic] Constant field tracking support.

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 4441 matching lines @@
           Handle<Object> value(from->RawFastPropertyAt(index), isolate());
           JSObject::AddProperty(to, key, value, details.attributes());
         } else {
           DCHECK_EQ(kAccessor, details.kind());
           UNREACHABLE();
         }
 
       } else {
         DCHECK_EQ(kDescriptor, details.location());
         if (details.kind() == kData) {
+          DCHECK(!FLAG_track_constant_fields);
           HandleScope inner(isolate());
           Handle<Name> key = Handle<Name>(descs->GetKey(i));
           Handle<Object> value(descs->GetValue(i), isolate());
           JSObject::AddProperty(to, key, value, details.attributes());
 
         } else {
           DCHECK_EQ(kAccessor, details.kind());
           Handle<Name> key(descs->GetKey(i));
           LookupIterator it(to, key, LookupIterator::OWN_SKIP_INTERCEPTOR);
           CHECK_NE(LookupIterator::ACCESS_CHECK, it.state());
@@ skipping 352 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8