calculate $smooth-per-core-util without .sum
calculate $smooth-per-core-util without .sum

we don't yet manage to throw the named args hash
away for the sum method, so we save a bunch of
allocations here.

softmoth/rakudo,nbrown/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,rakudo/rakudo,tbrowder/rakudo,tony-o/rakudo,labster/rakudo,tbrowder/rakudo,softmoth/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,salortiz/rakudo,lucasbuchala/rakudo,softmoth/rakudo,tony-o/rakudo,lucasbuchala/rakudo,rakudo/rakudo,softmoth/rakudo,tony-o/rakudo,Gnouc/rakudo,tony-o/rakudo,nbrown/rakudo,tbrowder/rakudo,rakudo/rakudo,softmoth/rakudo,tbrowder/rakudo,salortiz/rakudo,nbrown/rakudo,labster/rakudo,labster/rakudo,lucasbuchala/rakudo,rakudo/rakudo,rakudo/rakudo,MasterDuke17/rakudo,nbrown/rakudo,nbrown/rakudo,tony-o/rakudo,salortiz/rakudo,salortiz/rakudo,Gnouc/rakudo,tbrowder/rakudo,labster/rakudo,rakudo/rakudo,MasterDuke17/rakudo,labster/rakudo,tbrowder/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,nbrown/rakudo,labster/rakudo,lucasbuchala/rakudo,tony-o/rakudo,Gnouc/rakudo,salortiz/rakudo,MasterDuke17/rakudo,lucasbuchala/rakudo,salortiz/rakudo