Add kAbortIncrementalMarkingMask flag for GC.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index dc4bcee259d9be7a72eb68970193725095409215..442ad1d98c39ec810948f8a8c9924ddf4fb5c46e 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -420,14 +420,9 @@ class MarkCompactCollector {
   // Pointer to member function, used in IterateLiveObjects.
   typedef int (MarkCompactCollector::*LiveObjectCallback)(HeapObject* obj);
 
-  // Set the global force_compaction flag, it must be called before Prepare
-  // to take effect.
+  // Set the global flags, it must be called before Prepare to take effect.
   inline void SetFlags(int flags);
 
-  inline bool PreciseSweepingRequired() {
-    return sweep_precisely_;
-  }
-
   static void Initialize();
 
   void CollectEvacuationCandidates(PagedSpace* space);
@@ -579,6 +574,8 @@ class MarkCompactCollector {
 
   bool reduce_memory_footprint_;
 
+  bool abort_incremental_marking_;
+
   // True if we are collecting slots to perform evacuation from evacuation
   // candidates.
   bool compacting_;