Decouple root visitors from object visitors.

src/snapshot/serializer.cc

 // Copyright 2016 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/snapshot/serializer.h"
 
 #include "src/assembler-inl.h"
 #include "src/deoptimizer.h"
 #include "src/heap/heap-inl.h"
 #include "src/macro-assembler.h"
@@ skipping 81 matching lines @@
 
 void Serializer::SerializeDeferredObjects() {
   while (deferred_objects_.length() > 0) {
     HeapObject* obj = deferred_objects_.RemoveLast();
     ObjectSerializer obj_serializer(this, obj, &sink_, kPlain, kStartOfObject);
     obj_serializer.SerializeDeferred();
   }
   sink_.Put(kSynchronize, "Finished with deferred objects");
 }
 
-void Serializer::VisitPointers(Object** start, Object** end) {
+void Serializer::VisitRootPointers(Root root, Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
     if ((*current)->IsSmi()) {
       PutSmi(Smi::cast(*current));
     } else {
       SerializeObject(HeapObject::cast(*current), kPlain, kStartOfObject, 0);
     }
   }
 }
 
 void Serializer::EncodeReservations(
@@ skipping 685 matching lines @@
   if (to_skip != 0 && return_skip == kIgnoringReturn) {
     sink_->Put(kSkip, "Skip");
     sink_->PutInt(to_skip, "SkipDistance");
     to_skip = 0;
   }
   return to_skip;
 }
 
 }  // namespace internal
 }  // namespace v8