[heap] Remove obsolete was_marked_incrementally field.

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 760 matching lines @@
     SWEEP_SPACES,
     ENCODE_FORWARDING_ADDRESSES,
     UPDATE_POINTERS,
     RELOCATE_OBJECTS
   };
 
   // The current stage of the collector.
   CollectorState state_;
 #endif
 
-  bool reduce_memory_footprint_;
-
-  bool abort_incremental_marking_;
-
-  bool finalize_incremental_marking_;
+  // The following flags are controlled via {SetFlags} by the caller, it has to
+  // be called before {Prepare} to take effect.
+  bool reduce_memory_footprint_;       // Heap::kReduceMemoryFootprintMask
+  bool abort_incremental_marking_;     // Heap::kAbortIncrementalMarkingMask
+  bool finalize_incremental_marking_;  // Heap::kFinalizeIncrementalMarkingMask
 
   MarkingParity marking_parity_;
 
   // True if we are collecting slots to perform evacuation from evacuation
   // candidates.
   bool compacting_;
 
-  bool was_marked_incrementally_;
-
   // True if concurrent or parallel sweeping is currently in progress.
   bool sweeping_in_progress_;
 
   base::Semaphore pending_sweeper_jobs_semaphore_;
 
   bool evacuation_;
 
   SlotsBufferAllocator slots_buffer_allocator_;
 
   SlotsBuffer* migration_slots_buffer_;
@@ skipping 231 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_MARK_COMPACT_H_