RFR: 8290344: Start/stop displaysync affects performance in metal rendering pipeline

[Alexey Ushakov]

On Fri, 22 Jul 2022 18:59:21 GMT, Phil Race <prr at openjdk.org> wrote:

>  Looking at the RenderPerfTest numbers ClipFlatOvalAA went down .. but everything else improved by at the very least a statistically significant amount so why did that one test get worse ?

I'm unable to re-run the testing because of a regression [JDK-8291266](https://bugs.openjdk.org/browse/JDK-8291266). I'll be back to this pull request after resolving the regression.

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PR: https://git.openjdk.org/jdk/pull/9512