RFR: 8373207: Make DeferredStatic class template constant initializable

[Johan Sjölen]

On Mon, 8 Dec 2025 23:45:58 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to `DeferredStatic` to meet the requirements for
> constant initialization, to ensure dynamic initialization won't even be
> considered a possibility.
> 
> Testing: mach5 tier1.

Marked as reviewed by jsjolen (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28710#pullrequestreview-3555920336