re PR c++/35297 (Compiling error with variadic template with fixed parameter with default type.)
PR c++/35297
PR c++/35477
PR c++/35784
PR c++/36846
PR c++/38276
* pt.c (check_default_tmpl_args): Don't complain about
out-of-order parameter packs in the enclosing class
or parameter packs after default args.
(coerce_template_parms): If we have more than one
parameter pack, don't flatten argument packs.
(template_args_equal): Handle argument packs.
(comp_template_args): Don't flatten argument packs.
(check_instantiated_arg): Split out from...
(check_instantiated_args): Here. Handle arg packs.
(convert_template_argument): Just check that nontype argument
packs have the right type.
From-SVN: r143166