RFR: Update nmethod caching and clean up unused/duplicate methods [v9]

[Ashutosh Mehra]

On Mon, 16 Jun 2025 19:07:28 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> I forgot that we call AOTCodeCache::close() on VM exit. It is old workflow. So we do explicitly closing it during production run. Should we even do that with new workflow?

If we can make AOTCodeCache accessible until exit, then I guess we can continue using immutable data and oop_map from the cache.

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PR Comment: https://git.openjdk.org/leyden/pull/71#issuecomment-2977811361