RFR: 8331405: Shenandoah: Optimize ShenandoahLock with TTAS

[Aleksey Shipilev]

On Tue, 30 Apr 2024 19:55:51 GMT, Y. Srinivas Ramakrishna <ysr at openjdk.org> wrote:

> Can you share any comparative performance data, may be?

This was found by code inspection. I ran some tests, and the difference on very contended locks is small. It is certainly dominated by [JDK-8331411](https://bugs.openjdk.org/browse/JDK-8331411). So I think we better do some performance work with [JDK-8331411](https://bugs.openjdk.org/browse/JDK-8331411), not here.

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PR Comment: https://git.openjdk.org/jdk/pull/19018#issuecomment-2089885166