RFR: JDK-8316708: Augment WorstCaseTests with more cases

[Joe Darcy]

On Fri, 22 Sep 2023 15:48:26 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

> Both `Math.cos` and `StrictMath.cos` produce the correctly rounded result here. I don't know why the paper says otherwise. Perhaps OpenLibm is not exactly fdlibm.

I've looked a bit over the OpenLibm changelog. They've added a few special cases for exp and pow as leaset. OpenLibm itself is a direct derivative of one of the BSD math libraries, which in turn was derived from FDLIBM.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15879#discussion_r1501077887