8367646: [GenShen] Control thread may overwrite gc cancellation cause set by mutator#27662

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earthling-amzn wants to merge 2 commits intoopenjdk:masterfrom

earthling-amzn:fix-cancellation-race

Commits on Oct 6, 2025

Fix race between mutator and control thread over gc cancellation
earthling-amzn
committed

Commits on Oct 9, 2025

Fix cancellation time management, simplify normal cancellation API
earthling-amzn
committed