Revert r19897, r19898 for breaking mac-64 debug.

src/objects-visiting-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 881 matching lines @@
                   RelocInfo::ModeMask(RelocInfo::JS_RETURN) |
                   RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT) |
                   RelocInfo::ModeMask(RelocInfo::RUNTIME_ENTRY);
 
   // There are two places where we iterate code bodies: here and the
   // templated CodeIterateBody (below). They should be kept in sync.
   IteratePointer(v, kRelocationInfoOffset);
   IteratePointer(v, kHandlerTableOffset);
   IteratePointer(v, kDeoptimizationDataOffset);
   IteratePointer(v, kTypeFeedbackInfoOffset);
-  IterateNextCodeLink(v, kNextCodeLinkOffset);
   IteratePointer(v, kConstantPoolOffset);
 
   RelocIterator it(this, mode_mask);
   Isolate* isolate = this->GetIsolate();
   for (; !it.done(); it.next()) {
     it.rinfo()->Visit(isolate, v);
   }
 }
 
 
@@ skipping 14 matching lines @@
       reinterpret_cast<Object**>(this->address() + kRelocationInfoOffset));
   StaticVisitor::VisitPointer(
       heap,
       reinterpret_cast<Object**>(this->address() + kHandlerTableOffset));
   StaticVisitor::VisitPointer(
       heap,
       reinterpret_cast<Object**>(this->address() + kDeoptimizationDataOffset));
   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));
 
 
   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_