RFR: Reset coalesce and fill boundary during global collect

[William Kemper]

On Thu, 14 Oct 2021 22:27:49 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Normally, this happens during cset selection for the old generation. It also needs to happen for coalesce and fill at the end of global collections or objects may not be filled.

Sure - will add an explanatory comment there.

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PR: https://git.openjdk.java.net/shenandoah/pull/90