Unbreak Bags on the JVM backend
Unbreak Bags on the JVM backend

Should fix #4272, without losing any noticeable performance: the
nqp::ifnull logic still in place.

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