RFR: Update nmethod caching and clean up unused/duplicate methods [v3]

[Vladimir Kozlov]

On Wed, 4 Jun 2025 23:17:51 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> I did this only for the clarity - using `_blob_offset` is for storing Stubs doesn't sound correct, so I added `_code_offset` for the Stubs. If it is confusing, I can keep `_blob_offset` and remove the `_code_offset` field.
>
> I would suggest to use old `_code_ofset` for now. As we discussed on meeting we will need separate _metadata_offset to move all data describing code so we can map whole section of codes directly into CodeCache.

Or we can compromise: `_codeblob_offset, _codeblob_size`
Stubs are also using CodeBlob. I don't get why you treat stubs differently.

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PR Review Comment: https://git.openjdk.org/leyden/pull/71#discussion_r2127729156