openmp: Check for PARM_DECL before using C_ARRAY_PARAMETER or DECL_ARRAY_PARAMETER_P...

openmp: Check for PARM_DECL before using C_ARRAY_PARAMETER or DECL_ARRAY_PARAMETER_P [PR96867]

The C++ macro performs a PARM_DECL_CHECK, so will ICE if not tested on a PARM_DECL,
C_ARRAY_PARAMETER doesn't, but probably should, otherwise it is testing e.g.
C_DECL_VARIABLE_SIZE on VAR_DECLs.

2020-09-01  Jakub Jelinek  <jakub@redhat.com>

	PR c++/96867
	* c-typeck.c (handle_omp_array_sections_1): Test C_ARRAY_PARAMETER
	only on PARM_DECLs.

	* semantics.c (handle_omp_array_sections_1): Test
	DECL_ARRAY_PARAMETER_P only on PARM_DECLs.

	* c-c++-common/gomp/pr96867.c: New test.