[Bug tree-optimization/123113] factor_out_conditional_operation could be improved to handle `EDGE_COUNT (merge->preds) != 2`

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123113

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
factor_out_conditional_operation is harder to handle because we can't really do
on demand forwarder block creation. Because the phi for the one which we were
going to use need to be found. Or maybe wait the new forwarder block is the new
merge anyways. I need to double check that.

So the other patches could be simplified anyways ...