RFR: 8307816: Add missing STS to ZGC

[Thomas Schatzl]

On Wed, 10 May 2023 13:43:36 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> Testing in project Lilliput has revealed that ZGC is lacking one STS. Without it, ZGC could reach to already-deflated monitor when trying to fetch a displaced header, in order to get to an object's Klass* (e.g. to get its size).
> 
> Testing:
>  - [x] hotspot_gc

Please also close out the CR manually then as GenZGC has been integrated. Thanks.

I already added a comment to the CR about that this is likely only a problem with regular ZGC+Lilliput and for now the consensus is that are not intending to support that combination.

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PR Comment: https://git.openjdk.org/jdk/pull/13904#issuecomment-1545343176
PR Comment: https://git.openjdk.org/jdk/pull/13904#issuecomment-1545344921