RFR: 8329816: Add SLEEF version 3.6.1

[Hamlin Li]

On Fri, 10 May 2024 22:32:29 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

> [JDK-8312425](https://bugs.openjdk.org/browse/JDK-8312425) is looking to optimize vector math operations by leveraging the SLEEF library. For legal reasons the actual contribution of the SLEEF files needs to be handled separately. This enhancement adds the relevant files, enabling the rest of [JDK-8312425](https://bugs.openjdk.org/browse/JDK-8312425) to move forward.

In case you need it and avoid to generate yourself, I've generated sleef inline header of 3.6.1 for riscv, it's at https://github.com/openjdk/jdk/pull/18605/commits/c279a3c290554892939267d9ebe88198988d31a4

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PR Comment: https://git.openjdk.org/jdk/pull/19185#issuecomment-2186590880