RFR: 8329816: Add SLEEF version 3.6.1

[Magnus Ihse Bursie]

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.

I understand that you want to avoid renaming files, if they are imported. That is a good point. Moving them to an arch subdirectory does not seem like much additional hassle (there's apparently still a lot of manual work involved in upgrading the source from the third party upstream), and might help readers that are not deeply familiar with these platforms. But then again, if we only talk about header files, it is not strictly needed, so if you don't want to do it, then skip it.

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PR Comment: https://git.openjdk.org/jdk/pull/19185#issuecomment-2128971931