RFR: 8253971: ZGC: Flush mark stacks after processing concurrent roots

[Per Liden]

On Mon, 5 Oct 2020 05:55:18 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> We might also want to poke out mark stacks on the VM thread when we handshake threads, using a concurrent VM operation.
> But maybe that is a problem for another day.

Yes, I do that in a separate patch I have in the works (which aims to simplify mark termination/flushing, and make it
more robust).

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PR: https://git.openjdk.java.net/jdk/pull/495