[test] add test for reg alloc crash GH #1168
[test] add test for reg alloc crash GH #1168

detected by afl-fuzz. See docs/dev/fuzzing.pod

youprofit/parrot,youprofit/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,parrot/parrot,youprofit/parrot,parrot/parrot,youprofit/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,youprofit/parrot,tkob/parrot,parrot/parrot,parrot/parrot,parrot/parrot,tkob/parrot