Age code to allow reclaiming old unexecuted functions

src/mark-compact.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 628 matching lines @@
   inline void set_encountered_weak_maps(Object* weak_map) {
     encountered_weak_maps_ = weak_map;
   }
 
   void InvalidateCode(Code* code);
 
   void ClearMarkbits();
 
   bool is_compacting() const { return compacting_; }
 
+  MarkingParity marking_parity() { return marking_parity_; }
+
  private:
   MarkCompactCollector();
   ~MarkCompactCollector();
 
   bool MarkInvalidatedCode();
   void RemoveDeadInvalidatedCode();
   void ProcessInvalidatedCode(ObjectVisitor* visitor);
 
 
 #ifdef DEBUG
@@ skipping 12 matching lines @@
 #endif
 
   // Global flag that forces sweeping to be precise, so we can traverse the
   // heap.
   bool sweep_precisely_;
 
   bool reduce_memory_footprint_;
 
   bool abort_incremental_marking_;
 
+  MarkingParity marking_parity_;
+
   // True if we are collecting slots to perform evacuation from evacuation
   // candidates.
   bool compacting_;
 
   bool was_marked_incrementally_;
 
   // A pointer to the current stack-allocated GC tracer object during a full
   // collection (NULL before and after).
   GCTracer* tracer_;
 
@@ skipping 146 matching lines @@
 
   friend class Heap;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_