RFR: 8354244: Use random data in MinMaxRed_Long data arrays

[Christian Hagedorn]

On Thu, 24 Jul 2025 06:45:59 GMT, Galder Zamarreño <galder at openjdk.org> wrote:

> Simplified the data used in the tests added in [JDK-8307513](https://bugs.openjdk.org/browse/JDK-8307513). The data does not need to have a specific shape because this test focuses on verifying the IR when vectorization kicks in, and when it does, the data can just be random. Shaping the data to control branch taken/not-taken paths makes sense when CMov macro expansion kicks in instead of vectorization.
> 
> When switching to random data I noticed that the test was randomly failing. This was due to potential overflows that result from takin the min/max and then multiplying it by 11, so I've adjusted that section of the test as well.
> 
> I've run the test on both aarch64 and x64 platforms where this test would get vectorized. To verify that I made sure the test passed and verified that the jtr output to make sure the IR conditions were matched.

Nice clean-up by using the `Generators`. Looks good to me! Let me submit some testing with the updated test only.

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Marked as reviewed by chagedorn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/26451#pullrequestreview-3050667024