Serializer: serialize internal references via object visitor.

src/heap/objects-visiting.h

Index: src/heap/objects-visiting.h
diff --git a/src/heap/objects-visiting.h b/src/heap/objects-visiting.h
index 30005ec622ace5c0fff41e1d80d67bd0a165c8d4..2bc90457acdbb63bb70fcd5a0d7b362b7c25acb6 100644
--- a/src/heap/objects-visiting.h
+++ b/src/heap/objects-visiting.h
@@ -413,6 +413,7 @@ class StaticMarkingVisitor : public StaticVisitorBase {
   INLINE(static void VisitCodeTarget(Heap* heap, RelocInfo* rinfo));
   INLINE(static void VisitCodeAgeSequence(Heap* heap, RelocInfo* rinfo));
   INLINE(static void VisitExternalReference(RelocInfo* rinfo)) {}
+  INLINE(static void VisitInternalReference(RelocInfo* rinfo)) {}
   INLINE(static void VisitRuntimeEntry(RelocInfo* rinfo)) {}
   // Skip the weak next code link in a code object.
   INLINE(static void VisitNextCodeLink(Heap* heap, Object** slot)) {}