RFR: Allow young collection to suspend marking in old generation [v14]

[Roman Kennke]

On Wed, 3 Mar 2021 16:26:06 GMT, Bernd Mathiske <bmathiske at openjdk.org> wrote:

>> Do you plan to enable reference processing again on old-gen marking? Because I think it's a bad idea to not do it. Ideally, we'd do reference processing on both young-gen and old-gen markings, if that is not possible, then we should at least do it on old-gen markings (I believe other GCs don't do it in young-gen).
>
> Yes, we plan to make reference processing function again and at a minimum this will hold for non-young collections.

Hey, you shout out when you think it's ready to go, yes? Because I think instead of piling more stuff into this PR, we should instead integrate it ASAP, and then progress with smaller PRs. Ok?

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PR: https://git.openjdk.java.net/shenandoah/pull/19