RFR: Reserve regions for the collector according to generational reserves

[Kelvin Nilsen]

On Thu, 9 Jun 2022 17:22:26 GMT, William Kemper <wkemper at openjdk.org> wrote:

> When the freeset is rebuilt, it reserves a number of regions for evacuation proportional to the total size of the heap. With default settings, this will reserve more regions than intended for the generational mode and may lead to premature allocation failures for mutators.

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.org/shenandoah/pull/143