The error_mark_node is not an OpenMP mappable type.

	gcc/
	* langhooks.c (lhd_omp_mappable_type): The error_mark_node is not
	an OpenMP mappable type.
	gcc/c/
	* c-decl.c (c_decl_attributes): Use
	lang_hooks.types.omp_mappable_type.
	* c-typeck.c (c_finish_omp_clauses): Likewise.
	gcc/testsuite/
	* c-c++-common/gomp/map-1.c: Extend.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@208394 138bc75d-0d04-0410-961f-82ee72b054a4