RFR: 8367401: Parallel: Remove unused field in PSKeepAliveClosure

[Albert Mingkun Yang]

On Thu, 11 Sep 2025 09:13:56 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Looks good. I wouldn't mind if you also removed the:
> 
> ```
> assert(_promotion_manager != nullptr, "Sanity");
> ```

It's to ensure the passed-in arg is not null. There is only one caller, which does provide a valid arg, but for catching misuse more promptly, I'd keep it.

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PR Comment: https://git.openjdk.org/jdk/pull/27210#issuecomment-3279447585