[Bug tree-optimization/121762] pass_fold_builtins and pass_optimize_widening_mul and pass_gimple_isel should be merged or moved other places

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121762

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For -Og, I am going to exchange pass_fold_builtins/pass_copy_prop for
pass_forwprop (full_walk=false, last=true). This should in theory speed things
up slightly.