[perl #132273] [SEGV] while running t/spec/S17-supply/supplier-preserving.t

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Running it in a loop produces a SEGV once in a while:

    while t/fudgeandrun t/spec/S17-supply/supplier-preserving.t; do true; done

IRC: https://irclog.perlgeek.de/perl6-dev/2017-10-11#i_15291238