tests: Add regression test for ppoll() / pselect() race.

These tests demonstrate the bug that was fixed in ccb973da1f1b.

Sponsored by: Klara, Inc.
Sponsored by: NetApp, Inc.
Reviewed by: markj
Diff

tests: Add regression test for ppoll() / pselect() race.

These tests demonstrate the bug that was fixed in ccb973da1f1b.

Sponsored by: Klara, Inc.
Sponsored by: NetApp, Inc.
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D47738

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