`GenCollectedHeap::process_roots` is always called by the VM thread only (in serial GC), so all parallel constructs can be removed, namely the field of `SubTasksDone` and the arg of `StrongRootsScope`.
- relates to
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JDK-8260643 Remove parallel version handling in CardTableRS::younger_refs_in_space_iterate()
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- Resolved
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- Resolved
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