[Bug middle-end/82853] Optimize x % 3 == 0 without modulo

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82853

ktkachov at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ktkachov at gcc dot gnu.org

--- Comment #15 from ktkachov at gcc dot gnu.org ---
I tried to do something similar at
https://gcc.gnu.org/ml/gcc-patches/2015-07/msg02005.html and the feedback was
that we should do this at expand time