[perl #127401] Set|Bag|MixHash can be recursive, so need perlseen/gistseen covering

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# New Ticket Created by  Elizabeth Mattijsen 
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[09:41:46]  <lizmat>    m: my $s = SetHash.new; $s{$s} = 1; dd $s   # another 
case of recursive data structures we need to cover
[09:42:01]  <+camelia>  rakudo-moar 86a90b: OUTPUT«Memory allocation failed; 
could not allocate 3984 bytes␤»
[09:44:58]  <moritz>    na, we just need more memory on the eval server :-)