Use new throwextype to cheapen next/last/redo.
Use new throwextype to cheapen next/last/redo.

Cuts ~12% of CPU instructions off 'my $i = 0; for ^500000 { next if $_
>= 50000; $i++ }; say $i'.

awwaiid/rakudo,rakudo/rakudo,MasterDuke17/rakudo,b2gills/rakudo,usev6/rakudo,salortiz/rakudo,lucasbuchala/rakudo,tony-o/rakudo,lucasbuchala/rakudo,tbrowder/rakudo,softmoth/rakudo,tbrowder/rakudo,rakudo/rakudo,softmoth/rakudo,labster/rakudo,tbrowder/rakudo,awwaiid/rakudo,labster/rakudo,awwaiid/rakudo,nbrown/rakudo,rakudo/rakudo,tony-o/rakudo,raydiak/rakudo,b2gills/rakudo,awwaiid/rakudo,rakudo/rakudo,samcv/rakudo,tbrowder/rakudo,samcv/rakudo,samcv/rakudo,salortiz/rakudo,Gnouc/rakudo,Gnouc/rakudo,usev6/rakudo,tbrowder/rakudo,zostay/rakudo,rakudo/rakudo,awwaiid/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,salortiz/rakudo,tony-o/rakudo,Gnouc/rakudo,zostay/rakudo,sjn/rakudo,lucasbuchala/rakudo,samcv/rakudo,salortiz/rakudo,tony-o/rakudo,raydiak/rakudo,sjn/rakudo,jonathanstowe/rakudo,salortiz/rakudo,MasterDuke17/rakudo,b2gills/rakudo,jonathanstowe/rakudo,nbrown/rakudo,zostay/rakudo,sjn/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,softmoth/rakudo,usev6/rakudo,MasterDuke17/rakudo,softmoth/rakudo,tony-o/rakudo,MasterDuke17/rakudo,sjn/rakudo,raydiak/rakudo,rakudo/rakudo,nbrown/rakudo,tony-o/rakudo,nbrown/rakudo,b2gills/rakudo,salortiz/rakudo,jonathanstowe/rakudo,labster/rakudo,MasterDuke17/rakudo,softmoth/rakudo,sjn/rakudo,jonathanstowe/rakudo,labster/rakudo,b2gills/rakudo,labster/rakudo,lucasbuchala/rakudo,Gnouc/rakudo,nbrown/rakudo,labster/rakudo,usev6/rakudo,zostay/rakudo,raydiak/rakudo,jonathanstowe/rakudo,usev6/rakudo,samcv/rakudo,nbrown/rakudo