[patch, fortran] Remove parallell annotation from DO CONCURRENT

[Thomas Koenig]

Hello world,

the attached patch removes the parallel annotation from DO CONCURRENT.
As discussed in the PR, the autoparallellizer currently generates
wrong code. The only feasible way is to disable the annotation for
gcc-8 and work on the wrong-code issues for gcc-9. This is an 8
regression.

Regression-tested. OK for trunk?

Regards

	Thomas

2018-04-09  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/83064
         * trans-stmt.c (gfc_trans_forall_loop): Remove annotation for
         parallell processing of DO CONCURRENT.

2018-04-09  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/83064
         * gfortran.dg/do_concurrent_5.f90: New test.
         * gfortran.dg/vect/vect-do-concurrent-1.f90: Xfail. Adjust
         dg-bogus message.
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