RFR: 8370527: Memory leak after 8316694: Implement relocation of nmethod within CodeCache [v5]

[duke]

On Wed, 29 Oct 2025 01:26:43 GMT, Chad Rakoczy <duke at openjdk.org> wrote:

>> [JDK-8370527](https://bugs.openjdk.org/browse/JDK-8370527)
>> 
>> [JDK-8316694](https://bugs.openjdk.org/browse/JDK-8316694) introduced an `immutable_data_references_counter` which keeps track of the number of nmethods using the immutable data so it can be shared between relocated nmethods. The old code reads the counter, decrements the counter, and then checks the first read to see if it is zero. Since the check is performed on the initial read it will never be zero which causes immutable data to never be freed.
>
> Chad Rakoczy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add include to fix build issue

@chadrako 
Your change (at version 6739c4fa36f44b80fe100682c24d1ed715b817d6) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/28008#issuecomment-3471709662