[Bug c++/68948] G++ voluntarily removes a function call with terrible side effects

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68948

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 37074
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37074&action=edit
Reduced a lot

This is a much more reduced testcase though most likely it can be reduced
further.