RFR: 8307395: Add missing STS to Shenandoah

[Aleksey Shipilev]

On Thu, 4 May 2023 11:34:15 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> Testing in project Lilliput has revealed that Shenandoah GC is lacking one STS. This causes a reliable crash (with Lilliput) when running TestGCBasherWithShenandoah.java with -XX:+UseHeavyMonitors because it touches an already deflated monitor.
> 
> Testing (all in Lilliput where it caused the troubles, but applies to upstream as well):
>  - [x] TestGCBasherWithShenandoah.java +UseHeavyMonitors
>  - [x] hotspot_gc_shenandoah +UseHeavyMonitors

Looks fine, provided testing is clean.

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13799#pullrequestreview-1412969497