RFR: 8329816: Add SLEEF version 3.6.1 [v2]

[Mikael Vidstedt]

> [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.

Mikael Vidstedt has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Add SLEEF version 3.6.1
 - Merge branch 'master' into 8329816-sleef
 - 8329816: Add SLEEF version 3.6

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/19185/files
  - new: https://git.openjdk.org/jdk/pull/19185/files/b02efa6b..b29de559

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19185&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19185&range=00-01

  Stats: 160121 lines in 2836 files changed: 111602 ins; 34872 del; 13647 mod
  Patch: https://git.openjdk.org/jdk/pull/19185.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19185/head:pull/19185

PR: https://git.openjdk.org/jdk/pull/19185