[master] Integrated: Implement ZGC support

[Roman Kennke]

On Thu, 10 Mar 2022 21:00:31 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> Looks good.

Thanks, Erik.

However, I am back-paddling a little bit. Putting the STS in concurrent marking seems to break a number of tests. I am not quite sure why, though. OTOH, I believe it is necessary to do the STS during marking, because marking needs to access the Klass* (for object layout), and this needs be be safe wrt monitor deflation. I am investigating.

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PR: https://git.openjdk.java.net/lilliput/pull/44