Ping ** (6./7.) [patch, fortran] Implement BACK for minloc and maxloc

[Thomas Koenig]

> Regression-tested. OK for trunk? I'll hold off committing until
> gcc 8 is actually released, just in case.

Ping?

I'd like to get this off my tree before it rots, and also so I can focus
on other things like supporting Nicolas' async I/O patch and
getting rid of the recently reported regressions.

Regards

	Thomas