[patch, fortran] Fix PR 89384

[Thomas Koenig]

Hello world,

this patch fixes the 9 regression in C interop with contiguous
arguments recently reported by Reinhold Bader.

ChangeLog and patch say it all.  I hope I didn't overlook any
obvious things here (Paul, maybe you can take a look).

Regression-tested. OK for trunk?

Regards

	Thomas

2019-02-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/89384
	* trans-expr.c (gfc_conv_gfc_desc_to_cfi_desc): If the dummy
	argument is contiguous and the actual argument may not be,
	use gfc_conv_subref_array_arg.

2019-02-18  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/89384
	* gfortran.dg/ISO_Fortran_binding_4.f90
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