RFR: 8373389: Two jdk/incubator/vector/ tests fails after JDK-8371446

[Paul Sandoz]

On Thu, 11 Dec 2025 06:46:11 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> > Although this addition does reveals a potential bug in C2's av.reduceLanes(VectorOperators.MUL, vmask) implementation, it unfortunately introduces nosy, non-deterministic tier3 test failures in the vector API test suite.
> 
> Does that mean we should problem-list the tests, instead of changing them?

Its a trade off, we really want to problem list the problematic data and only on certain platforms, but we can't and so problem listing the test is broader than we would actually like. Further, resolving why the tests are failing for that data on the specific AVX512 platforms may take some time. So in this case i think it best to revert closer to the prior data we used, while retaining the updated test computation.

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PR Comment: https://git.openjdk.org/jdk/pull/28757#issuecomment-3642796124