RFR: 8371778: Make MallocMemorySummary::_snapshot a DeferredStatic

[Afshin Zafari]

On Wed, 12 Nov 2025 07:48:38 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Hi,
> 
> This PR wraps the` MallocMemorySummary::_snapshot` in a `DeferredStatic`. This is not strictly necessary as MallocMemorySnapshot does not have a non-trivial constructor, but it does give us more consistency and does act as a safe guard for future changes. 
> 
> Testing: GHA

Thank you for this. Looks good to me.

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Marked as reviewed by azafari (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28257#pullrequestreview-3477740722