RFR: Following abbreviated cycle, only increment region age if aging cycle

[William Kemper]

On Wed, 1 Feb 2023 15:36:16 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> The previously existing code that processes regions following completion of an abbreviated cycle unconditionally
> increased the age of all regions that had not allocated memory during the cycle.  It should only increment age of
> regions if this is an aging cycle.  This patch fixes this behavior.

Marked as reviewed by wkemper (Committer).

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PR: https://git.openjdk.org/shenandoah/pull/214