RFR: 8290025: Remove the Sweeper [v3]

[Johannes Bechberger]

On Thu, 4 Aug 2022 11:57:39 GMT, Ludovic Henry <luhenry at openjdk.org> wrote:

>> Thanks for the review, @stefank
>
> Hi @fisk, thanks for the amazing cleanup! We've had a bunch of issues with the code sweeper and AsyncGetCallTrace with trying to unwind from dead code blobs (or what looked like it at least). Have you run some stress tests for AsyncGetCallTrace and this change? It may be something we can look into to make sure it doesn't increase the chances of crashes, or even reduces the chances of crashes. CC @jbachorik @parttimenerd

> @luhenry @fisk I'm going to stress test it with my [jdk-profiling-tester](https://github.com/parttimenerd/jdk-profiling-tester) on M1 and x86 over night (comparing it with the current master).

My script is unable to find any crashes (in both JDK builds on both platforms) which is good for AsyncProfiler users but bad for the overall use of my tester. I'll have to investigate that.

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PR: https://git.openjdk.org/jdk/pull/9741