RFR: 8321371: SpinPause() not implemented for bsd_aarch64/macOS

[Evgeny Astigeevich]

On Wed, 6 Dec 2023 14:01:49 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

> The SpinPause() function only returns 0 on bsd_aarch64 (i.e. macOS)
> 
> This PR initially meant to implement SpinPause() for macOS on AArch64 by copying the source from linux_aarch64, but after having some internal discussions, it seems like the most reasonable thing to do is to implement SpinPause() using a single inline yield instruction.
> 
> Tested successfully on macosx-aarch64 tier1-tier5.

According to https://github.com/openjdk/jdk/pull/5562#issuecomment-966230710, `isb` works well on Apple M1.

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PR Comment: https://git.openjdk.org/jdk/pull/16994#issuecomment-1853736360