Reduce VC++ padding in IncrementalMarking class

src/heap/incremental-marking.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_INCREMENTAL_MARKING_H_
 #define V8_HEAP_INCREMENTAL_MARKING_H_
 
 #include "src/cancelable-task.h"
 #include "src/execution.h"
 #include "src/heap/heap.h"
@@ skipping 253 matching lines @@
 
   void IncrementIdleMarkingDelayCounter();
 
   void AdvanceIncrementalMarkingOnAllocation();
 
   size_t StepSizeToKeepUpWithAllocations();
   size_t StepSizeToMakeProgress();
 
   Heap* heap_;
 
-  State state_;
-
   double start_time_ms_;
   size_t initial_old_generation_size_;
   size_t old_generation_allocation_counter_;
   size_t bytes_allocated_;
   size_t bytes_marked_ahead_of_schedule_;
   size_t unscanned_bytes_of_large_object_;
 
+  State state_;
+
   int idle_marking_delay_counter_;
   int incremental_marking_finalization_rounds_;
 
   bool is_compacting_;
   bool should_hurry_;
   bool was_activated_;
   bool black_allocation_;
   bool finalize_marking_completed_;
   bool trace_wrappers_toggle_;
+  IncrementalMarkingJob incremental_marking_job_;
 
   GCRequestType request_type_;
 
-  IncrementalMarkingJob incremental_marking_job_;
   Observer new_generation_observer_;
   Observer old_generation_observer_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_INCREMENTAL_MARKING_H_