Make heap.h usable without objects-inl.h header.

src/heap/objects-visiting.h

 // Copyright 2012 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_OBJECTS_VISITING_H_
 #define V8_OBJECTS_VISITING_H_
 
 #include "src/allocation.h"
 #include "src/heap/spaces.h"
 #include "src/layout-descriptor.h"
@@ skipping 130 matching lines @@
  public:
   void CopyFrom(VisitorDispatchTable* other) {
     // We are not using memcpy to guarantee that during update
     // every element of callbacks_ array will remain correct
     // pointer (memcpy might be implemented as a byte copying loop).
     for (int i = 0; i < StaticVisitorBase::kVisitorIdCount; i++) {
       base::NoBarrier_Store(&callbacks_[i], other->callbacks_[i]);
     }
   }
 
+  inline Callback GetVisitor(Map* map);
+
   inline Callback GetVisitorById(StaticVisitorBase::VisitorId id) {
     return reinterpret_cast<Callback>(callbacks_[id]);
   }
 
-  inline Callback GetVisitor(Map* map) {
-    return reinterpret_cast<Callback>(callbacks_[map->visitor_id()]);
-  }
-
   void Register(StaticVisitorBase::VisitorId id, Callback callback) {
     DCHECK(id < StaticVisitorBase::kVisitorIdCount);  // id is unsigned.
     callbacks_[id] = reinterpret_cast<base::AtomicWord>(callback);
   }
 
   template <typename Visitor, StaticVisitorBase::VisitorId base,
             StaticVisitorBase::VisitorId generic, int object_size_in_words>
   void RegisterSpecialization() {
     static const int size = object_size_in_words * kPointerSize;
     Register(StaticVisitorBase::GetVisitorIdForSize(base, generic, size, false),
@@ skipping 324 matching lines @@
 // the next element. Given the head of the list, this function removes dead
 // elements from the list and if requested records slots for next-element
 // pointers. The template parameter T is a WeakListVisitor that defines how to
 // access the next-element pointers.
 template <class T>
 Object* VisitWeakList(Heap* heap, Object* list, WeakObjectRetainer* retainer);
 }
 }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_H_