[perl #121349] Cannot push native ints to an array on parrot backend

[Christian Bartolomaeus via RT]

This now also works on Parrot (same result on Moar and JVM):

$ perl6-p -e 'my @j; my int $j = 42; @j.push($j); say @j'
42

I added a test to S02-types/native.t with commit 
https://github.com/perl6/roast/commit/f9b1da5bb8

I'm closing this ticket now.