RFR: 8369444: JavaFrameAnchor on PPC64 has unnecessary barriers

[David Briemann]

On Tue, 14 Oct 2025 00:47:01 GMT, Dean Long <dlong at openjdk.org> wrote:

> If all CPU ports follow this, then it seems like we could eventually implement JavaFrameAnchor in shared code without CPU-specific parts.

Seems like a good idea. However there are still differences for the different CPUs. E.g. aarch64 still contains a release memory barrier.
This might be a good follow-up task.

I would like to deliver this cleanup for PPC first.

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PR Comment: https://git.openjdk.org/jdk/pull/27768#issuecomment-3402020226