RFR: 8315024: Vector API FP reduction tests should not test for exact equality [v2]

[Emanuel Peter]

On Fri, 6 Oct 2023 18:34:52 GMT, Gergö Barany <gbarany at openjdk.org> wrote:

>> Certain floating point reduction operations in the Vector API are allowed to introduce rounding errors. Adjust the corresponding tests to allow a small relative error when comparing the operation's result to the expected value. Also, add a new generator `double[i / 10.0 + 0.1]` to test floating point operations with somewhat more interesting input data.
>
> Gergö Barany has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address review comments

@gergo- Sounds ok. We don't have to do all in your change here. Thanks for the work you did!

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Marked as reviewed by epeter (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16024#pullrequestreview-1680005467