Fix ICE when cache-3-1.c testcase is run

Fix ICE when cache-3-1.c testcase is run

A change that was present in the OG11 version of
'openmp: in_reduction clause support on target construct' but
not in the mainline version resulted in non-contiguous
arrays being accepted in cache clauses, only to ICE later.

2022-03-17  Kwok Cheung Yeung  <kcy@codesourcery.com>

	gcc/c/
	* c-typeck.cc (handle_omp_array_sections_1): Add check to ensure
	that clause is a map.

	gcc/cp/
	* semantics.cc (handle_omp_array_sections_1):  Add check to ensure
	that clause is a map.