[Bug c++/91705] [9/10 Regression] operator++ broken in constexpr floating point code

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91705

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
But using fold_simple instead does seem to work, so I'll go with that.