Change inlined cache of intanceof stub to use indirection through cell.

src/incremental-marking.h

Index: src/incremental-marking.h
diff --git a/src/incremental-marking.h b/src/incremental-marking.h
index 25def8706867528565304500a460c332fec2c47b..4f8fa6b1275b0995a919503972c6ed8b360daaa5 100644
--- a/src/incremental-marking.h
+++ b/src/incremental-marking.h
@@ -56,6 +56,7 @@ class IncrementalMarking {
   }
 
   bool should_hurry() { return should_hurry_; }
+  void set_should_hurry(bool val) { should_hurry_ = val; }
 
   inline bool IsStopped() { return state() == STOPPED; }
 
@@ -219,10 +220,6 @@ class IncrementalMarking {
   void UncommitMarkingDeque();
 
  private:
-  void set_should_hurry(bool val) {
-    should_hurry_ = val;
-  }
-
   int64_t SpaceLeftInOldSpace();
 
   void ResetStepCounters();