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Back-patch 9.4-era commit44cd47c1d4
into 9.2 and 9.3. As with my back-patches of yesterday, this was not seen as necessary at the time because we didn't expect barrier.h to need to work before 9.4, but commit37de8de9e3
invalidated that theory. Per an attempt to run gaur and pademelon over old branches they've not been run on since ~2013.