[Bug middle-end/90904] vec assignment and copying undefined

[msebor at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90904

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Looks like move ctor/assignment have been added to auto_vec in
g:4b9d61f79c0c0185a33048ae6cc72269cf7efa31 but not copy ctor/assignment.