RFR: 8343789: Move mutable nmethod data out of CodeCache [v9]

[Stefan Karlsson]

On Mon, 3 Feb 2025 09:50:58 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> @stefank just pointed out that this could be a regression from [JDK-8347564](https://bugs.openjdk.org/browse/JDK-8347564) that just went in.

I thought that it could have been a regression but after looking closer I don't think it is. However, I do see a problem that the code removes the GC barriers when loading oops. I'll add an inline comment.

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PR Comment: https://git.openjdk.org/jdk/pull/21276#issuecomment-2630828942