[Bug testsuite/28032] gfortran.dg tests use dg-options with -On even though it is already torture tests

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28032

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It needs to be on a line on its own, and start with dg-

So: 

! { dg-gfortran-onepass }

And rename the proc to match.