[patch, fortran, committed] Fix PR 92863, 'ICE in gfc_typename

[Thomas Koenig]

Hello world,

I have just committed the attached patch as obvious and simple
as r279180.

The ICE for the test case occurred because a previous error
had left the derived field of the typespec NULL. Just returning
"invalid type" or "invalid class" in such a case is enough
to cure the ICE.

Regards

	Thomas

2019-12-10  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/92863
	* misc.c (gfc_typename): If derived component is NULL for
	derived or class, return "invalid type" or "invalid class",
	respectively.

2019-12-10  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/92863
	* gfortran.dg/interface_45.f90: New test.

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