Introduce instance type for transition arrays.

src/heap/mark-compact.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_MARK_COMPACT_H_
 #define V8_HEAP_MARK_COMPACT_H_
 
 #include "src/base/bits.h"
 #include "src/heap/spaces.h"
 
@@ skipping 666 matching lines @@
   // The linked list of all encountered weak maps is destroyed.
   void ClearWeakCollections();
 
   // We have to remove all encountered weak maps from the list of weak
   // collections when incremental marking is aborted.
   void AbortWeakCollections();
 
   void ProcessAndClearWeakCells();
   void AbortWeakCells();
 
+  void ProcessAndClearTransitionArrays();
+  void AbortTransitionArrays();
+
   // After all reachable objects have been marked, those entries within
   // optimized code maps that became unreachable are removed, potentially
   // trimming or clearing out the entire optimized code map.
   void ProcessAndClearOptimizedCodeMaps();
 
   // Process non-live references in maps and optimized code.
   void ProcessWeakReferences();
 
   // -----------------------------------------------------------------------
   // Phase 2: Sweeping to clear mark bits and free non-live objects for
@@ skipping 168 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_MARK_COMPACT_H_