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mm/mglru: introduce helpers for manipulating gen and refs flags

为MGLRU的gen和refs标志位操作封装辅助函数，替换直接位运算，拆分原子操作仅产生无害瞬态，无功能变化。

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← mm/memcontrol: make lru_zone_size atomic and simplify sanity check
mm/migrate: copy the referenced state via folio_migrate_refs() →