Make Supply.grab a few percent faster
Make Supply.grab a few percent faster

Use an IterationBuffer as the cache, and nqp::push rather than HLL
push.  Saves 1 Scalar and 1 BOOThash per value emitted.

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