[Omp] Another thing on the implicit barrier

[Greg Bronevetsky]

> For this loop, is it 3 implicit barriers before each "end do" in the 
> 3-level loop? Or just 1 implicit barrier  before the last "end do"?
>         Thank you very much.
>                                                 Shengyan Hong
> 
   Its one barrier per directive, so only one barrier at the last end do.

                             Greg Bronevetsky