RFR: 8293584: CodeCache::old_nmethods_do incorrectly filters is_unloading nmethods [v2]

[Coleen Phillimore]

On Fri, 18 Nov 2022 22:40:40 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> I fixed the code to also include is_unloading nmethods.  I couldn't write a dedicated test for this.
>> Tested with tier1-4,6.  Also tried to reproduce another redefinition bug with this change, which didn't reproduce, but not caused by this change.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add a comment.

Thanks for reviewing!

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PR: https://git.openjdk.org/jdk/pull/11243