RFR: 8343249: [Windows] Implement SpinPause [v4]

[Saint Wesonga]

On Tue, 13 Jan 2026 05:50:50 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Sorry Julian but this simply does not seem significant enough to warrant detailed review cycles from me.

I don't know if this changes your opinion here but the `-XX:OnSpinWaitInst` and `-XX:OnSpinWaitInstCount` flags are not respected on Windows AArch64 without the AArch64 change in this PR.

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PR Comment: https://git.openjdk.org/jdk/pull/21781#issuecomment-3751629637