RFR: 8359435: AArch64: add support for SB instruction to MacroAssembler::spin_wait

[Evgeny Astigeevich]

On Wed, 25 Jun 2025 15:44:59 GMT, Andrew Haley <aph at openjdk.org> wrote:

> > Looks okay to me. @theRealAph should also take a look.
> 
> I'm still waiting for a use for this thing. Then we'll be able to see it in action.

Do you mean we need real-life workloads relying on `j.l.Thread.onSpinWait` to show improvements?

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PR Comment: https://git.openjdk.org/jdk/pull/25801#issuecomment-3005433977