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Clean-up a couple of CAS loops to avoid loading after a compare_exchange (which updates the old value), and to loosen the memory ordering to acquire-release to avoid unnecessary fences. Change-Id: Ifb8e5e5136f687ca5a71417a5d131a7023add054 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2050390 Auto-Submit: Leszek Swirski <leszeks@chromium.org> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#66235}
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