Integrated: Improve some defaults and remove unused options for generational mode

[William Kemper]

On Thu, 10 Nov 2022 00:47:14 GMT, William Kemper <wkemper at openjdk.org> wrote:

> `ShenandoahPromoteTenuredObjects` and `ShenandoahUsePLABs` are removed.  The default `NewRatio` for generational mode is changed to 1. The default percentage of garbage for regions included in the old generation collection set is lowered to 10.

This pull request has now been integrated.

Changeset: 1b110a43
Author:    William Kemper <wkemper at openjdk.org>
URL:       https://git.openjdk.org/shenandoah/commit/1b110a43ff270d9aa00c4425c049b1f21838d5ee
Stats:     37 lines in 3 files changed: 2 ins; 10 del; 25 mod

Improve some defaults and remove unused options for generational mode

Reviewed-by: rkennke

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PR: https://git.openjdk.org/shenandoah/pull/169