[Bug libstdc++/61909] Small function optimization not applied to small objects

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61909

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
  std::function<void()> f3((X())); // abort

This works now, but the lambda still needs to allocate.