RFR: 8223312: Utilize handshakes instead of is_thread_fully_suspended [v3]

[Robbin Ehn]

On Thu, 22 Oct 2020 10:44:21 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Looks good. Awesome fix IMO.
>
> Passes my local testing: open/test/jdk/com/sun/jdi/EATests.java, nsk_jvmti, nsk_jdi, jdk_jdi, jck:vm.
> Still running t1-t5 in test system.
> 
> I will be integrating later today, so the ZGC/EscapeBarrier issue can be resolved (which is semi-dependent on this).
> 
> Thanks @dholmes-ora, @dcubed-ojdk, @reinrich, @fisk !

T1-5 looked good.

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PR: https://git.openjdk.java.net/jdk/pull/729