RFR: 8376119: G1: Convert volatiles in G1CMMarkStack to Atomic<T>

[Kim Barrett]

On Fri, 23 Jan 2026 12:34:41 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

> `struct TaskQueueEntryChunk { TaskQueueEntryChunk* next; G1TaskQueueEntry data[EntriesPerChunk]; };`
> 
> In this case, should we also have `TaskQueueEntryChunk* next;` as Atomic?

I only found uses of `next` while holding `G1MarkStackChunkList_lock`.

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PR Comment: https://git.openjdk.org/jdk/pull/29365#issuecomment-3791904793