[Bug c++/57509] Segmentation fault when using __builtin_shuffle in templated class.

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57509

--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Detail: normally we just pass around tsubst_flags_ts, no complain & tf_error to
bool, etc.