Fix Hash.classify-list for mixed-level classifications
Fix Hash.classify-list for mixed-level classifications

Do not assume the first returned value from the mapper indicates whether
we're doing multi-level or single level classification.

No adverse performance impact. Bench shows 0.02%-0.06% improvement.

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