Move map retaining to finalization of incremental marking.

src/heap/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 1794 matching lines @@
                                 GCIdleTimeHeapState heap_state, double start_ms,
                                 double deadline_in_ms);
 
   inline void UpdateAllocationsHash(HeapObject* object);
   inline void UpdateAllocationsHash(uint32_t value);
   void PrintAlloctionsHash();
 
   void AddToRingBuffer(const char* string);
   void GetFromRingBuffer(char* buffer);
 
+  void CompactRetainedMaps(ArrayList* retained_maps);
+
   // Attempt to over-approximate the weak closure by marking object groups and
   // implicit references from global handles, but don't atomically complete
   // marking. If we continue to mark incrementally, we might have marked
   // objects that die later.
   void FinalizeIncrementalMarking(const char* gc_reason);
 
   // Returns the timer used for a given GC type.
   // - GCScavenger: young generation GC
   // - GCCompactor: full GC
   // - GCFinalzeMC: finalization of incremental full GC
@@ skipping 904 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_