RFR: 8359435: AArch64: add support for 8.5 SB instruction

[Andrew Haley]

On Fri, 13 Jun 2025 17:11:20 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> So, it would be tad less confusing if we had a dependent RFE for using SB in spin pauses, so it was obvious why do we need it.

Huh? The least confusing is when the SB support goes in the PR where it is used. That really is obvious, without any dependency chain.

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PR Comment: https://git.openjdk.org/jdk/pull/25801#issuecomment-2972847134