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

src/heap/objects-visiting-inl.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_INL_H_
 #define V8_OBJECTS_VISITING_INL_H_
 
 #include "src/heap/objects-visiting.h"
 #include "src/ic/ic-state.h"
 #include "src/macro-assembler.h"
 
 namespace v8 {
 namespace internal {
 
+
+template <typename Callback>
+Callback VisitorDispatchTable<Callback>::GetVisitor(Map* map) {
+  return reinterpret_cast<Callback>(callbacks_[map->visitor_id()]);
+}
+
+
 template <typename StaticVisitor>
 void StaticNewSpaceVisitor<StaticVisitor>::Initialize() {
   table_.Register(
       kVisitShortcutCandidate,
       &FixedBodyVisitor<StaticVisitor, ConsString::BodyDescriptor, int>::Visit);
 
   table_.Register(
       kVisitConsString,
       &FixedBodyVisitor<StaticVisitor, ConsString::BodyDescriptor, int>::Visit);
 
@@ skipping 839 matching lines @@
 
   RelocIterator it(this, mode_mask);
   for (; !it.done(); it.next()) {
     it.rinfo()->template Visit<StaticVisitor>(heap);
   }
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_INL_H_