RFR: Enable remembered set verification during global collections [v3]

[Kelvin Nilsen]

On Thu, 9 Sep 2021 17:41:51 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> I'll try putting the 'fill-after-final-mark' on the code path that skips updates references and restoring this code. That way, we'll do one or the other, but not both.
>
> After thinking about this, I'd rather do it on a separate PR. We'd still want to fill before update references when `ShenandoahVerify` is enabled.

Thanks.  This sounds good.

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PR: https://git.openjdk.java.net/shenandoah/pull/64