RFR: 8318986: Improve GenericWaitBarrier performance [v5]

[Claes Redestad]

On Mon, 13 Nov 2023 21:52:09 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> Most quick benchmarks are done, but the bulk will take the night to complete.

All done, nothing else that stands out across a medium-size set (400+) of benchmark runs. One caveat is that we don't configure all that many server-style and intentionally large GC-heavy benchmarks on Windows and MacOS hosts, so we might have a bit of a blind spot here that I'll see if we can improve.

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PR Comment: https://git.openjdk.org/jdk/pull/16404#issuecomment-1809994382