Specialize ScavengingVisitor for the case when all logging and profiling is disabled.

src/heap.h

 // Copyright 2010 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 1433 matching lines @@
 
   void CreateFixedStubs();
 
   MaybeObject* CreateOddball(const char* to_string,
                              Object* to_number,
                              byte kind);
 
   // Allocate empty fixed array.
   MUST_USE_RESULT MaybeObject* AllocateEmptyFixedArray();
 
+  void SwitchScavengingVisitorsTableIfProfilingWasEnabled();
+
   // Performs a minor collection in new generation.
   void Scavenge();
 
   static String* UpdateNewSpaceReferenceInExternalStringTableEntry(
       Heap* heap,
       Object** pointer);
 
   Address DoScavenge(ObjectVisitor* scavenge_visitor, Address new_space_front);
 
   // Performs a major collection in the whole heap.
@@ skipping 788 matching lines @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_