Fix races in arena fusing #19768
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Fix races in arena fusing #19768
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* Add acquire/release where necessary for all atomic ops * Add sentinel member to ensure safe publication when tsan is active; tsan will not catch the previous errors without this member. * For all operations using relaxed memory order, comment why relaxed order is safe * Add a test that exercises racy fuses and space allocated checks without mutexes or other memory barriers from the test harness PiperOrigin-RevId: 708346752
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Fix races in arena fusing