re PR c/79758 (ICE: tree check: expected class 'type', have 'exceptional' (error_mark) in store_parm_decls_oldstyle, at c/c-decl.c:8973)

	PR c/79758
	* c-decl.c (store_parm_decls_oldstyle): Check if the element of
	current_function_prototype_arg_types is error_mark_node.  Fix
	formatting.  Use TREE_VALUE instead of TREE_TYPE.

	* gcc.dg/noncompile/pr79758.c: New test.

From-SVN: r245886