RFR: vthreads don't support the reserved stack zone

[Dean Long]

On Thu, 24 Mar 2022 17:40:26 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>  Can you pass thread to the overflow_state->in_stack_reserved_zone(thread, addr) instead?

I don't really like that, since it means stack overflow functions would need to know about virtual threads.  This function seems to be called in exactly one place, so I can just put the check in the signal handler where we check for arm32.

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