[patch, fortran] Fix contiguous dummy arguments

[Thomas Koenig]

Hello world,

the attached patch fixes handling of contiguous dummy arguments when
the actual arguments are not contiguous.

The patch to trans-expr.c itself was written by Paul and attached to
the PR. I just added the test case.  Regression-testing revealed some
failing scan-tree tests due to different code being generated. I put
corresponding run time tests into the new test case to make sure that no
wrong code is being generated.

I have also tested the new test case and the compiler with valgrind.

OK for trunk?

Regards

	Thomas

2018-01-19  Thomas Koenig  <tkoenig@gcc.gnu.org>
         Paul Thomas  <pault@gcc.gnu.org>

         PR fortran/56789
         * trans-expr.c (gfc_conv_procedure_call): Call
         gfc_conv_subref_array_arg if the formal arg is contiguous
         and the actual arg may not be.

2018-01-19  Thomas Koenig  <tkoenig@gcc.gnu.org>
         Paul Thomas  <pault@gcc.gnu.org>

         PR fortran/56789
         * gfortran.dg/contiguous_3.f90: Make code compilant.  Remove
         scan-tree tests that fail with patch.
         * gfortran.dg/contiguous_8.f90: New test.
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