Revert r19897, r19898 for breaking mac-64 debug.

src/objects-visiting-inl.h

Index: src/objects-visiting-inl.h
diff --git a/src/objects-visiting-inl.h b/src/objects-visiting-inl.h
index 877156418152b4c9038c642f8ae8368830de9142..db84664d425e05cafd2a1b8ca9828bf4ddd4024d 100644
--- a/src/objects-visiting-inl.h
+++ b/src/objects-visiting-inl.h
@@ -899,7 +899,6 @@ void Code::CodeIterateBody(ObjectVisitor* v) {
   IteratePointer(v, kHandlerTableOffset);
   IteratePointer(v, kDeoptimizationDataOffset);
   IteratePointer(v, kTypeFeedbackInfoOffset);
-  IterateNextCodeLink(v, kNextCodeLinkOffset);
   IteratePointer(v, kConstantPoolOffset);
 
   RelocIterator it(this, mode_mask);
@@ -934,9 +933,6 @@ void Code::CodeIterateBody(Heap* heap) {
   StaticVisitor::VisitPointer(
       heap,
       reinterpret_cast<Object**>(this->address() + kTypeFeedbackInfoOffset));
-  StaticVisitor::VisitNextCodeLink(
-      heap,
-      reinterpret_cast<Object**>(this->address() + kNextCodeLinkOffset));
   StaticVisitor::VisitPointer(
       heap,
       reinterpret_cast<Object**>(this->address() + kConstantPoolOffset));