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Hi all, please convert remaining volatile declarations in `G1ConcurrentMark` to use `Atomic<T>`. These volatiles are used to indicate concurrent phased access (like changing the variable in thread A, then reading the variable in thread B while A is dormant, or only ever updating it in one direction) where concurrency safety is provided by barriers between these phases. The exception is `G1ConcurrentMark::_finger` that has apparently been overlooked in an earlier changes. Testing: gha Thanks, Thomas
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