[Bug c++/89700] Warn if move constructor is not generated and not deleted

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89700

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No, because that would mean almost every class written for C++03 would fail to
compile in C++11 or later, which would be absurd.