[Bug tree-optimization/25290] PHI-OPT could be rewritten so that is uses match

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25290

--- Comment #21 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note this is not fully fixed, there is still some more work to do to deal with
the non single_non_singleton_phi_for_edges case which will allow to get rid of
value_replacement.

Note to get rid of early_p check and abs_replacement, we need to add
PROP_gimple_lswitch to say we have lowered switches already.