Faster List.from-slurpy-onearg (from 20% upto 4x)
Faster List.from-slurpy-onearg (from 20% upto 4x)

Which directly translates to same performance gains for the
(+@list) signature: 4x for no parameters, to 20% for exactly 1.
More than one parameter is about 2.5x faster.

- no longer revert to from-slurpy for cases != 1
  We've already done some of the work, why do it again?
- no longer need to create a Perl 6 level capture
  Since we don't need to pass it on.
- return bare List object for no parameters

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