RFR: JDK-8301833: Add manual tests for FDLIBM porting

[Joe Darcy]

On Mon, 6 Feb 2023 01:50:55 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> To help add assurances that the main-line port of FDLIBM to Java is working correctly, added some long-running manual tests to probe that the transliteration port and the corresponding StrictMath method are in agreement on a large number of argument, say, all float values.
> 
> To test the transliteration port, this test can be run against a build where the JDK has *not* had the FDLIBM code used for StrictMath ported to Java.

PS The manual test passes when run against a JDK 20 build, helping to validate the new-in-21 transliteration ports done so far in JDK 21 (log10, log1p, expm1).

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PR: https://git.openjdk.org/jdk/pull/12430