RFR: Only register retired plab waste in old regions

Thu Sep 30 00:15:33 UTC 2021

On Wed, 29 Sep 2021 23:00:44 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This is a follow up to [PR 74](https://github.com/openjdk/shenandoah/pull/74) in which we register filler objects from retired gclabs. This should _only_ be done if the plab was in an old region. Registering young objects in the remembered set confuses the verifier.

Marked as reviewed by kdnilsen (Committer).

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PR: https://git.openjdk.java.net/shenandoah/pull/77