Add kAbortIncrementalMarkingMask flag for GC.

src/heap.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 1023 matching lines @@
                       const char* gc_reason,
                       const char* collector_reason);
 
   // Performs garbage collection operation.
   // Returns whether there is a chance that another major GC could
   // collect more garbage.
   inline bool CollectGarbage(AllocationSpace space,
                              const char* gc_reason = NULL);
 
   static const int kNoGCFlags = 0;
-  static const int kMakeHeapIterableMask = 1;
+  static const int kSweepPreciselyMask = 1;
   static const int kReduceMemoryFootprintMask = 2;
+  static const int kAbortIncrementalMarkingMask = 4;
+
+  // Making the heap iterable requires us to sweep precisely and abort any
+  // incremental marking as well.
+  static const int kMakeHeapIterableMask =
+      kSweepPreciselyMask | kAbortIncrementalMarkingMask;
 
   // Performs a full garbage collection.  If (flags & kMakeHeapIterableMask) is
   // non-zero, then the slower precise sweeper is used, which leaves the heap
   // in a state where we can iterate over the heap visiting all objects.
   void CollectAllGarbage(int flags, const char* gc_reason = NULL);
 
   // Last hope GC, should try to squeeze as much as possible.
   void CollectAllAvailableGarbage(const char* gc_reason = NULL);
 
   // Check whether the heap is currently iterable.
@@ skipping 1609 matching lines @@
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_