[Bug c++/59760] use_thunk internal error on default destructor declarations

[sshannin at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59760

--- Comment #1 from sshannin at gmail dot com ---
For a simpler example, see
https://lists.debian.org/debian-gcc/2013/12/msg00107.html