RFR: 8358318: JFR: Tighten up PlatformTracer initialization

[Aleksey Shipilev]

On Mon, 2 Jun 2025 11:42:11 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> All event settings modifications happen with the "metadata" lock, so only one thread at a time can modify the state in MethodSetting. I think it's sufficient to remove volatile in that class. It's misleading.

See new commit. This drops `volatile`, looks generally cleaner, and avoids triggering analysis that complains about static field modifications from instance methods on top.

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PR Comment: https://git.openjdk.org/jdk/pull/25584#issuecomment-2931689864