[io grant] Make IO::Spec::Win32.splitdir 25x faster
[io grant] Make IO::Spec::Win32.splitdir 25x faster

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