RFR: 8304042: C2 SuperWord: schedule must remove packs with cyclic dependencies [v2]

[Emanuel Peter]

On Wed, 29 Mar 2023 17:39:43 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Do you know if this affect any our existing vector tests?

@vladimir Thanks for the review.
Yes. I had a run where I assert if I find cycles. I ran it up to tier5 and stress testing. And the assert was never triggered, except in the two regression tests that I added (there it triggered a lot). So I think it really has no effect, except the extra runtime.

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PR Comment: https://git.openjdk.org/jdk/pull/13078#issuecomment-1489774620