RFR: 8343789: Move mutable nmethod data out of CodeCache [v6]

[Boris Ulasevich]

On Tue, 14 Jan 2025 09:22:09 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Boris Ulasevich has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   removing dead code
>
> Looks like this also triggers with `compiler/escapeAnalysis/TestFindInstMemRecursion.java` on Linux x64 and `-XX:-TieredCompilation -XX:+StressReflectiveCode -XX:-ReduceInitialCardMarks -XX:-ReduceBulkZeroing -XX:-ReduceFieldZeroing`. This change needs more testing before integration.

@TobiHartmann 

> I see this failure in our testing with an internal test

Thanks for catching that issue! I've addressed it.

> This change needs more testing before integration.

Thank you for pointing that out. Here is my test plan for additional validation. Please let me know if you have any suggestions or if adjustments are needed:

Functional Testing:
- Platforms: x86 and AArch64
- Build Configurations: Release, Fastdebug, and Slowdebug
- Java Options: Default and -XX:+UseShenandoahGC
- Tests: jtreg tests covering Hotspot and JDK, tiers 1–3

Performance Testing:
- Benchmarks: DaCapo and Renaissance
- Modes: Default and -XX:+UseShenandoahGC

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PR Comment: https://git.openjdk.org/jdk/pull/21276#issuecomment-2618866815