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Sergei Trofimovich authored
Commit 5d52d9b6 removed global 'blackhole_queue' in favour of new mechanism: when TSO hits blackhole TSO blocks waiting for 'MessgaeBlackhole' delivery. Patch removed unused global and updates stale comments. Noticed by Yuras Shumovich. Signed-off-by: Sergei Trofimovich <siarheit@google.com> Test Plan: build test Reviewers: simonmar, austin, Yuras, bgamari Reviewed By: Yuras, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1953
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