RFR: 8331771: ZGC: Remove OopMapCacheAlloc_lock ordering workaround

[Aleksey Shipilev]

On Tue, 7 May 2024 09:00:47 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> After [JDK-8331714](https://bugs.openjdk.org/browse/JDK-8331714), we don't need the Generational Z kludge that works around the lock ranking problem with (now gone) `OopMapCacheAlloc_lock`. I also reverted the `DisableIs*Mark` that was added specifically for that kludge in JDK 21. This simplifies further additions of new marks that do not have to replicate `Disable*` code.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `hotspot_gc`

Thanks all! Do you think this is simple enough to go in already, without waiting for the rest of 24 hours? I am interested in getting other related patches out :)

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PR Comment: https://git.openjdk.org/jdk/pull/19114#issuecomment-2098509999