RFR: 8346123: [REDO] NMT should not use ThreadCritical [v12]

[David Holmes]

On Mon, 6 Jan 2025 19:19:23 GMT, Robert Toyonaga <duke at openjdk.org> wrote:

> However, it looks like `WatcherThread::stop()` is called early in `before_exit` -- after which point NMT can still be used. 

Yeah good catch. I just find it frustrating that we already have so many initialization-progress markers but we are looking at adding yet-another-one. Also I'm not sure this is really relevant to mutex itself per-se it is rather about whether mutexes are needed - to that end I don't find `Threads::is_single_threaded() ` a terrible suggestion.

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PR Comment: https://git.openjdk.org/jdk/pull/22745#issuecomment-2574379871