[master] RFR: Implement Shenandoah support [v22]

[Zhengyu Gu]

On Wed, 20 Apr 2022 12:43:22 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> I meant why it is relevant to this PR? Should this be fixed upstream first?
>
> No, involving GCs in the deflation protocol is only really relevant in Lilliput. And this change does it for Shenandoah. I was thinking to remove the flag altogether - not participating in deflation in Lilliput is a correctness problem and we should not even allow that.

I see.

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PR: https://git.openjdk.java.net/lilliput/pull/32