Properly close the CountOperation value/effect context after leaving the store effect context.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 25522e87ec0b128fd4f020486e4fbb06c5162a8a..2692b3f1b8cf1df2f02e4668e793e6643dfb4f28 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -7573,9 +7573,10 @@ void HOptimizedGraphBuilder::VisitCountOperation(CountOperation* expr) {
           EffectContext for_effect(this);
           Push(object);
           Push(after);
-          return BuildStoreNamed(expr, expr->id(), expr->position(),
-                                 expr->AssignmentId(), prop, object, after);
+          BuildStoreNamed(expr, expr->id(), expr->position(),
+                          expr->AssignmentId(), prop, object, after);
         }
+        return ast_context()->ReturnValue(Pop());
       }
 
       return BuildStoreNamed(expr, expr->id(), expr->position(),