Fix missing write barrier in store field stub.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index c68befd15ae14b72ad439899d17e310e0cdc1f89..0f6cb6e473d7454dd9cb1709f3b2faef1f1feaf3 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -4198,6 +4198,10 @@ class HStoreNamedField: public HTemplateInstruction<2> {
         ReceiverObjectNeedsWriteBarrier(object(), new_space_dominator());
   }
 
+  bool NeedsWriteBarrierForMap() {
+    return ReceiverObjectNeedsWriteBarrier(object(), new_space_dominator());
+  }
+
  private:
   Handle<String> name_;
   bool is_in_object_;