RFR: JDK-8301396: Port fdlibm expm1 to Java [v2]

[Joe Darcy]

On Mon, 6 Feb 2023 08:19:36 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> @jddarcy Are you planning a GC of unused functions in StrictMath.c too? (for this PR I'm wondering about Java_java_lang_StrictMath_expm1).

Yes, once the port is done, I'll remove all the remaining FDLIBM C files. There are dependencies between the different C files, sinh calls expm1, etc., so to avoid needed to untangle all of those, I was going to do the removal in one step at the end.

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PR: https://git.openjdk.org/jdk/pull/12394