RFR: 8356173: Remove ThreadCritical [v3]

[Kim Barrett]

On Fri, 9 May 2025 22:06:25 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> As I said in another comment, Windows appears to require a call to an initialization function.  So this seems
>> like a good candidate for Deferred<> to me, removing some relatively boiler-plate code.
>
> I'm not really sold on what the purpose of Deferred is tbh.  Seems like it would add some more boilerplate since I the initialization function is only one obvious line.

The initialization lines are similar one-liners.
Deferred<> access already had the initialized check built-in, so don't need the explicit assert.
Deferred<> avoids the pointer indirection.
Deferred<> avoids dynamic allocation.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25072#discussion_r2082791117