Unify the Count Operation assignment with other assignments.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 6a49e5708de953eb5cb74e88906afe9526c18b79..31483bd20d6664f66ce0629a180aae490843ed94 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1709,12 +1709,14 @@ class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor {
                                         BailoutId assignment_id,
                                         HValue* object,
                                         HValue* value,
+                                        HValue* result,
                                         SmallMapList* types,
                                         Handle<String> name);
   bool TryStorePolymorphicAsMonomorphic(int position,
                                         BailoutId assignment_id,
                                         HValue* object,
                                         HValue* value,
+                                        HValue* result,
                                         SmallMapList* types,
                                         Handle<String> name);
   void HandlePolymorphicCallNamed(Call* expr,
@@ -1794,7 +1796,8 @@ class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor {
                        BailoutId assignment_id,
                        Property* prop,
                        HValue* object,
-                       HValue* value);
+                       HValue* store_value,
+                       HValue* result_value = NULL);
 
   HInstruction* BuildStoreNamedField(HValue* object,
                                      Handle<String> name,