RFR: 8329816: Add SLEEF version 3.6

[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.

> Let me suggest that we wait for the next release of SLEEF to be released in that case since that release seems to be imminent. That way we'll get both the performance fixes _and_ we can include the RISC-V header files at the same time. Fair?

Yes, it makes sense to me. Thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/19185#issuecomment-2116848373