Reduce VC++ padding in IncrementalMarking class

src/heap/incremental-marking.h

Index: src/heap/incremental-marking.h
diff --git a/src/heap/incremental-marking.h b/src/heap/incremental-marking.h
index 48e03d289da915d00448f769504d5094bba5a9cc..c71328cc508423e2b972851fb3a66bc570aa4f4e 100644
--- a/src/heap/incremental-marking.h
+++ b/src/heap/incremental-marking.h
@@ -271,8 +271,6 @@ class V8_EXPORT_PRIVATE IncrementalMarking {
 
   Heap* heap_;
 
-  State state_;
-
   double start_time_ms_;
   size_t initial_old_generation_size_;
   size_t old_generation_allocation_counter_;
@@ -280,6 +278,8 @@ class V8_EXPORT_PRIVATE IncrementalMarking {
   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_;
 
@@ -289,10 +289,10 @@ class V8_EXPORT_PRIVATE IncrementalMarking {
   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_;