RFR: vthreads don't support the reserved stack zone

[Dean Long]

On Thu, 24 Mar 2022 20:51:19 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> vthreads don't support the reserved stack zone
>
> I guess all ways of fixing it spreads knowledge of virtual threads, which the thread code knows the most about.  I guess your original change is the best.  I moved all of those functions out of Thread but I guess this one has to go back.

@coleenp , I pushed a new version before seeing your comment.  Let me know which version you like better.

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PR: https://git.openjdk.java.net/loom/pull/120