Generalize virtually dispatched scavenger to virtually dispatched specialized visitors.

src/heap.h

 // Copyright 2006-2008 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 965 matching lines @@
 
   static Object* NumberToString(Object* number,
                                 bool check_number_string_cache = true);
 
   static Map* MapForExternalArrayType(ExternalArrayType array_type);
   static RootListIndex RootIndexForExternalArrayType(
       ExternalArrayType array_type);
 
   static void RecordStats(HeapStats* stats, bool take_snapshot = false);
 
-  static Scavenger GetScavenger(int instance_type, int instance_size);
-
   // Copy block of memory from src to dst. Size of block should be aligned
   // by pointer size.
   static inline void CopyBlock(Address dst, Address src, int byte_size);
 
   static inline void CopyBlockToOldSpaceAndUpdateRegionMarks(Address dst,
                                                              Address src,
                                                              int byte_size);
 
   // Optimized version of memmove for blocks with pointer size aligned sizes and
   // pointer size aligned addresses.
@@ skipping 720 matching lines @@
 // invocation IFF --trace_gc is used.
 
 class GCTracer BASE_EMBEDDED {
  public:
   class Scope BASE_EMBEDDED {
    public:
     enum ScopeId {
       EXTERNAL,
       MC_MARK,
       MC_SWEEP,
+      MC_SWEEP_NEWSPACE,
       MC_COMPACT,
       MC_FLUSH_CODE,
       kNumberOfScopes
     };
 
     Scope(GCTracer* tracer, ScopeId scope)
         : tracer_(tracer),
         scope_(scope) {
       start_time_ = OS::TimeCurrentMillis();
     }
@@ skipping 241 matching lines @@
 
   // To speed up scavenge collections new space string are kept
   // separate from old space strings.
   static List<Object*> new_space_strings_;
   static List<Object*> old_space_strings_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_