[patch, fortran, committed] Small -fdump-fortran-original fixes, plus documentation update

[Thomas Koenig]

Hello world,

I have committed a few small fixes for -fdump-fortran-original and
friends.

Since there was interest on c.l.f from somebdoy who actually wanted to
use the dump for something useful, I have also clarified in the docs
that this is something that is not guaranteed to work between releases.

Regards

	Thomas

2017-10-08  Thomas Koenig  <tkoenig@gcc.gnu.org>

         * dump_prase_tree (show_symbol): Output list of variables in
         NAMELIST.
         (show_code_node): Add new line for ELSE and END DO for DO
         CONCURRENT.
         * invoke.texi: Document that the output of
         -fdump-fortran-original, -fdump-fortran-optimized and
         -fdump-parse-tree is unsable and may lead to ICEs.
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