RFR: 8362193: Re-work MacOS/AArch64 SpinPause to handle SB [v3]

[Andrew Haley]

On Tue, 22 Jul 2025 16:07:05 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> @fbredber @theRealAph, thoughts?

That's fine. It's supposed to be a delay, and an indirect jump won't hurt. It's a lot less disruptive than an ISB in many cases, and as far as I can tell ISB is the best we've got today.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26387#discussion_r2223172651