RFR: 8366037: Remove oopDesc::mark_addr() [v2]

[Kim Barrett]

On Mon, 25 Aug 2025 10:46:21 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> I wonder though if it would make sense to have a function, say, `void* oopDesc::base_addr()` and use that instead of the added casts?

I like that better, so changed accordingly. Will need re-review from everyone.
@shipilev @stefank @tschatzl

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PR Comment: https://git.openjdk.org/jdk/pull/26914#issuecomment-3222479609