Well, here's a variation which actually passes regression-test.

Seems I implicitly believed that the implicit save on main program
variables actually works... well, it turns out that it doesn't,
which is now PR85364.

OK for trunk?

	Thomas

2018-04-12  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/83064
         PR testsuite/85346
         * trans-stmt.c (gfc_trans_forall_loop): Use annot_expr_ivdep_kind
         for annotation and remove dependence on -ftree-parallelize-loops.

2018-04-12  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/83064
         PR testsuite/85346
         * gfortran.dg/do_concurrent_5.f90: Dynamically allocate main work
         array and move test to libgomp/testsuite/libgomp.fortran.
         * gfortran.dg/do_concurrent_6.f90: New test.

2018-04-12  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/83064
         PR testsuite/85346
         * testsuite/libgomp.fortran: Move modified test from gfortran.dg
         to here.