RFR: 8289003: JavaThread::check_is_terminated() implementation should rely on Thread-SMR

[Daniel D. Daugherty]

On Thu, 14 Jul 2022 21:50:04 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

> A small fix to change `JavaThread::check_is_terminated()` to rely on Thread-SMR.
> The change is textually trivial, but requires a bit of thinking about the JavaThread
> lifecycle. Since this is a cleanup of some old Thread-SMR related changes, I also
> took the time to cleanup some comments and white space while I was visiting the
> uses of `_vm_exited`.
> 
> Mach5 Tier1 has no related failures. Mach5 Tier[23] testing has just started.

@coleenp, @fisk, @robehn or @pchilano - I need one more review from someone that has
been in the Thread-SMR code, if you can spare a few cycles...

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PR: https://git.openjdk.org/jdk/pull/9502