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

[Vladimir Kozlov]

On Wed, 4 Jun 2025 17:11:05 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

>> src/hotspot/share/code/aotCodeCache.hpp line 107:
>> 
>>> 105: 
>>> 106:   uint   _blob_offset; // Start of archived blob in the cache
>>> 107:   uint   _code_offset; // Start of code for an entry of type "Stub"
>> 
>> Why you need 2 different fields for offset?
>
> 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.

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PR Review Comment: https://git.openjdk.org/leyden/pull/71#discussion_r2127582863