[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 #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 63849
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63849&action=edit
This is the cselim_limited part

Still no testcases. And needs comments and still deciding if all of
make_forwarder_block should migrate to the new form or not.