[Bug c/124699] [13 Regression] Expression using __builtin_ffsll() may not be considered constant

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124699

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #6)
> I am not sure if r14-4592-g0d00385eaf72cc is a fix or just works around the
> issue.

Unless it is fold-const.cc or match.pd hunk which fixes this. Later this week I
will try to see if those hunks fix the issue here unless someone beats me to
it.