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Sergei Trofimovich authored
Assuming there is no real SMP systems on these CPUs I've added only compiler barrier (otherwise write_barrier and friends need to be fixed as well). Patch also fixes build breakage reported in #10244. Signed-off-by: Sergei Trofimovich <siarheit@google.com> Reviewers: rwbarton, nomeata, austin Reviewed By: nomeata, austin Subscribers: bgamari, thomie Differential Revision: https://phabricator.haskell.org/D894 GHC Trac Issues: #10244
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