RFR: vthreads don't support the reserved stack zone

[Coleen Phillimore]

On Thu, 24 Mar 2022 08:37:07 GMT, Dean Long <dlong at openjdk.org> wrote:

> vthreads don't support the reserved stack zone

I hate to be picky but I don't like that this had to move in_stack_reserved_zone.  We wanted to move all the stack overflow functions out of thread.
Can you pass thread to the overflow_state->in_stack_reserved_zone(thread, addr) instead?

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