Streamline ThreadPoolScheduler!total-workers
Streamline ThreadPoolScheduler!total-workers

- make sure we don't box/unbox unneccesarily
- add "is raw" so that we don't box/unbox on return
  - this appears to make the return from sub about 20% faster
  - when assigning to a native

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