re PR c++/86063 (g++ ICE at  tree check: expected tree_list, have expr_pack_expansion in cp_check_const_attributes, at cp/decl2.c:1391)

	PR c++/86063
	* decl2.c (cp_check_const_attributes): Skip trees that are not
	TREE_LISTs.

	* g++.dg/cpp0x/gen-attrs-65.C: New test.

From-SVN: r261613