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1b1ed1a
(Get the code!)
The above comment aside, we might end up disabling lock elision on *all* the architectures that support it due to fears of broken software in the wild that violates pthread double-unlock rules, something only coming to light recently due to ppc64el/s390x users being very much in a minority, and x86 users only starting to see the issues as they refresh to hardware new enough to support hardware lock elision.