[Bug c++/84916] Tweaks to template type elision

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84916

--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #4)
> I have a patch for this, queuing for gcc 10 stage 1.

It's gcc 10 stage 1