re PR c++/13969 (static const value rejected as template parameter)

re PR c++/13969 (static const value rejected as template parameter)

	PR c++/13969
	* g++.dg/template/static6.C: New test.

	PR c++/13969
	* cp-tree.h (fold_non_dependent_expr): New function.
	* parser.c (cp_parser_fold_non_dependent_expr): Remove.
	(cp_parser_template_argument): Use fold_non_dependent_expr.
	(cp_parser_direct_declarator): Likewise.
	* pt.c (fold_non_dependent_expr): New function.
	(convert_nontype_argument): Use it.
	(tsubst_qualified_id): Simplify.
	(tsubst_copy_and_build): Likewise.

From-SVN: r77260