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.

I think it's okay here because this code is only called to coalesce and fill regions during a global collect. Preemption during a global collect shouldn't be a concern (young collects can only preempt old marking, they can't preempt a global collect).

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