RFR: 8255243: Reinforce escape barrier interactions with ZGC conc stack processing

[Daniel D.Daugherty]

On Fri, 23 Oct 2020 13:18:53 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> Forgot to mention, but I tested this from tier1-5, to sanity check that the new solution doesn't introduce any new issues.
>
> @fisk thanks for pinging. I remember reading about a new vector API a while ago and noticed that it potentially interferes with escape barriers but then I lost track. I'll look at this.

Thanks for adding the tier testing info. Sounds like there is no need for new
tests since this is "just" a RAII object to reinforce existing code interactions,
but please confirm that...

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PR: https://git.openjdk.java.net/jdk/pull/832