RFR: 8274024: Use regular accessors to internal fields of oopDesc

[Kim Barrett]

On Sat, 25 Sep 2021 22:39:56 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> It turns out there's a pre-existing problem about that; both the proposed changes here and pre-existing code technically invoke UB. See JDK-8274322.

See https://github.com/openjdk/jdk/pull/5729

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PR: https://git.openjdk.java.net/jdk/pull/5585