RFR: Coalesce and fill unmarked objects during global degenerated cycle

[Kelvin Nilsen]

On Mon, 4 Oct 2021 19:47:57 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This is necessary to prevent the remembered set scan from iterating over garbage. We already do this for _concurrent_ global cycles, but it was missing from _degenerated _ global cycles.

Looks good.  Thanks for catching this bug and cleaning up the other code.

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Marked as reviewed by kdnilsen (Committer).

PR: https://git.openjdk.java.net/shenandoah/pull/78