Add a host parameter to ObjectVisitor methods.

src/visitors.h

 // Copyright 2017 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.
 
 #ifndef V8_VISITORS_H_
 #define V8_VISITORS_H_
 
 #include "src/allocation.h"
 
 namespace v8 {
@@ skipping 28 matching lines @@
 
   static const char* const kTags[kNumberOfSyncTags];
   static const char* const kTagNames[kNumberOfSyncTags];
 };
 
 enum class Root {
 #define DECLARE_ENUM(enum_item, ignore1, ignore2) enum_item,
   ROOT_ID_LIST(DECLARE_ENUM)
 #undef DECLARE_ENUM
   // TODO(ulan): Merge with the ROOT_ID_LIST.
+  kCodeFlusher,
   kPartialSnapshotCache,
   kWeakCollections
 };
 
 // Abstract base class for visiting, and optionally modifying, the
 // pointers contained in roots. Used in GC and serialization/deserialization.
 class RootVisitor BASE_EMBEDDED {
  public:
   virtual ~RootVisitor() {}
 
@@ skipping 10 matching lines @@
   // check for the presence of, a tag at this position in the stream.
   // Also used for marking up GC roots in heap snapshots.
   // TODO(ulan): Remove this.
   virtual void Synchronize(VisitorSynchronization::SyncTag tag) {}
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_VISITORS_H_