Make BUILDALL/BUILD_LEAST_DERIVED about 10% faster
Make BUILDALL/BUILD_LEAST_DERIVED about 10% faster

Benchmarked on a class with 3 public attributes not being initialized

tony-o/rakudo,labster/rakudo,nbrown/rakudo,azawawi/rakudo,softmoth/rakudo,softmoth/rakudo,lucasbuchala/rakudo,azawawi/rakudo,ab5tract/rakudo,labster/rakudo,jonathanstowe/rakudo,ab5tract/rakudo,salortiz/rakudo,raydiak/rakudo,rakudo/rakudo,MasterDuke17/rakudo,ab5tract/rakudo,tony-o/rakudo,azawawi/rakudo,awwaiid/rakudo,rakudo/rakudo,labster/rakudo,tbrowder/rakudo,nbrown/rakudo,Gnouc/rakudo,usev6/rakudo,azawawi/rakudo,samcv/rakudo,samcv/rakudo,samcv/rakudo,b2gills/rakudo,usev6/rakudo,jonathanstowe/rakudo,ab5tract/rakudo,lucasbuchala/rakudo,rakudo/rakudo,usev6/rakudo,lucasbuchala/rakudo,rakudo/rakudo,MasterDuke17/rakudo,jonathanstowe/rakudo,salortiz/rakudo,softmoth/rakudo,awwaiid/rakudo,salortiz/rakudo,tbrowder/rakudo,zostay/rakudo,sjn/rakudo,b2gills/rakudo,tony-o/rakudo,b2gills/rakudo,softmoth/rakudo,tony-o/rakudo,ab5tract/rakudo,tbrowder/rakudo,salortiz/rakudo,MasterDuke17/rakudo,usev6/rakudo,nbrown/rakudo,raydiak/rakudo,b2gills/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,b2gills/rakudo,zostay/rakudo,sjn/rakudo,lucasbuchala/rakudo,sjn/rakudo,awwaiid/rakudo,labster/rakudo,Gnouc/rakudo,raydiak/rakudo,jonathanstowe/rakudo,samcv/rakudo,raydiak/rakudo,zostay/rakudo,salortiz/rakudo,sjn/rakudo,labster/rakudo,Gnouc/rakudo,tony-o/rakudo,zostay/rakudo,labster/rakudo,sjn/rakudo,MasterDuke17/rakudo,samcv/rakudo,tbrowder/rakudo,salortiz/rakudo,awwaiid/rakudo,usev6/rakudo,Gnouc/rakudo,tbrowder/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,nbrown/rakudo,tony-o/rakudo,softmoth/rakudo,Gnouc/rakudo,nbrown/rakudo,rakudo/rakudo,azawawi/rakudo,nbrown/rakudo,rakudo/rakudo,MasterDuke17/rakudo,awwaiid/rakudo