[Bug tree-optimization/104547] std::vector::resize(v.size() - n) produces poor code

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104547

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks for looking at it! There's no urgency here from my point of view, I just
wanted to get it into bugzilla so I could concentrate on other things. Parking
this until stage1 makes sense.