RFR: 8305895: Implement JEP 450: Compact Object Headers (Experimental) [v43]

[Roman Kennke]

On Wed, 16 Oct 2024 12:13:32 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> We're seeing failures in our nightly testing for tests runtime/cds/appcds/SharedBaseAddress.java and runtime/cds/SharedBaseAddress.java which I'm tracking in this bug [JDK-8340212](https://bugs.openjdk.org/browse/JDK-8340212)
> 
> This patch should problem list these two tests on aarch64 when UseCompactObjectHeaders is on (if possible to be that specific), or just plain problem list it until I have a fix for it.

Thanks for pointing this out. I've problem-listed both tests on aarch64.

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PR Comment: https://git.openjdk.org/jdk/pull/20677#issuecomment-2416881886