RFR: Allow heuristic trigger to increase capacity instead of running a collection

[Kelvin Nilsen]

On Fri, 30 Dec 2022 00:07:29 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Before the adaptive heuristic starts a collection, it will attempt to increase the capacity of its generation. If the capacity is increased, the heuristic will re-evaluate the trigger criteria.
> 
> There is also a change here to attempt to increase the size of the old generation in response to a promotion failure.

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.org/shenandoah/pull/190