RFR: Use distinct "end of cycle" message for each Shenandoah pause [v2]

Tue May 2 23:24:52 UTC 2023

On Tue, 2 May 2023 23:17:24 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> I moved it into `ShenandoahConcurrentGC::op_final_roots` to fit the pattern of other phases (`VM_Operation_XYZ` and `entry_XYZ` should just have GC tracking boiler plate). Also, with this approach, we don't have to marshal the `is_aging_cycle` around.
>
> Thanks for clarifying.

As I think on this a bit more... we should probably also age regions during final update refs. The "final roots" phase only happens on abbreviated cycles.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/270#discussion_r1183128208