RFR: Adaptive heuristic should take reserved memory into account [v2]

[Roman Kennke]

On Tue, 28 Jun 2022 20:34:03 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Just had a look at the heuristic in upstream and it _is_ using freeset available, so this change fixes a regression introduced only on the generational mode branch.

Ok great, then!
Thanks for checking!

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PR: https://git.openjdk.org/shenandoah/pull/147