format-stress-smoke-test failed on Ubuntu 18.04 zSeries

Host: ubuntu1804-z-5.dallasisv.build.10gen.cc
Project: WiredTiger (develop)
Commit: diff: WT-6235 Reorder prepare commit and rollback operations (#5672)

Co-authored-by: Alex Cameron <alex.cameron@10gen.com>
Co-authored-by: Haribabu Kommi <haribabu.kommi@mongodb.com> | 18 May 20 02:46 UTC
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