Explicitly track whether incremental marking was activated

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 "src/allocation.h"
@@ skipping 1918 matching lines @@
 
   Address DoScavenge(ObjectVisitor* scavenge_visitor, Address new_space_front);
   static void ScavengeStoreBufferCallback(Heap* heap, MemoryChunk* page,
                                           StoreBufferEvent event);
 
   // Performs a major collection in the whole heap.
   void MarkCompact();
 
   // Code to be run before and after mark-compact.
   void MarkCompactPrologue();
+  void MarkCompactEpilogue();
 
   void ProcessNativeContexts(WeakObjectRetainer* retainer);
   void ProcessArrayBuffers(WeakObjectRetainer* retainer);
   void ProcessAllocationSites(WeakObjectRetainer* retainer);
 
   // Deopts all code that contains allocation instruction which are tenured or
   // not tenured. Moreover it clears the pretenuring allocation site statistics.
   void ResetAllAllocationSitesDependentCode(PretenureFlag flag);
 
   // Evaluates local pretenuring for the old space and calls
@@ skipping 635 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_