RFR(XS) 8184991: NMT detail diff should take memory type into account

[Zhengyu Gu]

Thanks for the review.
>
>  *)  320   // Report type only it is valid
>
>  "Report type only *if* it is valid"?
>
I will fix this.

-Zhengyu

> Otherwise looks good.
>
> Thanks,
> -Aleksey
>