Remove dead code path from optimizer.
Remove dead code path from optimizer.

We stopped using the lexotic op and mechanism for return handlers a
long time ago; this is a relic from then.

nbrown/rakudo,awwaiid/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo,rakudo/rakudo,tbrowder/rakudo,softmoth/rakudo,sjn/rakudo,salortiz/rakudo,salortiz/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,usev6/rakudo,softmoth/rakudo,rakudo/rakudo,labster/rakudo,tony-o/rakudo,nbrown/rakudo,awwaiid/rakudo,MasterDuke17/rakudo,usev6/rakudo,lucasbuchala/rakudo,sjn/rakudo,salortiz/rakudo,tony-o/rakudo,tbrowder/rakudo,tony-o/rakudo,rakudo/rakudo,tbrowder/rakudo,nbrown/rakudo,jonathanstowe/rakudo,usev6/rakudo,raydiak/rakudo,Gnouc/rakudo,nbrown/rakudo,sjn/rakudo,sjn/rakudo,rakudo/rakudo,softmoth/rakudo,MasterDuke17/rakudo,usev6/rakudo,sjn/rakudo,tbrowder/rakudo,awwaiid/rakudo,softmoth/rakudo,MasterDuke17/rakudo,labster/rakudo,raydiak/rakudo,labster/rakudo,Gnouc/rakudo,labster/rakudo,MasterDuke17/rakudo,lucasbuchala/rakudo,usev6/rakudo,Gnouc/rakudo,tbrowder/rakudo,salortiz/rakudo,rakudo/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,raydiak/rakudo,Gnouc/rakudo,raydiak/rakudo,tony-o/rakudo,tbrowder/rakudo,awwaiid/rakudo,tony-o/rakudo,softmoth/rakudo,nbrown/rakudo,jonathanstowe/rakudo,tony-o/rakudo,labster/rakudo,MasterDuke17/rakudo,jonathanstowe/rakudo,rakudo/rakudo,salortiz/rakudo,labster/rakudo,salortiz/rakudo,jonathanstowe/rakudo,nbrown/rakudo,awwaiid/rakudo