[Bug rtl-optimization/39350] MOVE_BY_PIECES_P is used by rtl optimizers

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39350

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This area has changed a lot really.  In r5-4585, it is now a target hook.