[Bug c++/63579] New attribute for empty member optimization

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63579

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 33750
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33750&action=edit
Hack to handle empty members as bases