Port of Float16 from java.lang in the lworld+fp16 branch to jdk.incubabor.vector.
------------- Commit messages: - Update with changes from lworld+fp16 Float16. - Merge branch 'master' into JDK-8341260 - Add support for BigDecimal -> Float16 conversion. - JDK-8341260: Add Float16 to jdk.incubator.vector Changes: https://git.openjdk.org/jdk/pull/21574/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21574&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8341260 Stats: 2355 lines in 4 files changed: 2350 ins; 0 del; 5 mod Patch: https://git.openjdk.org/jdk/pull/21574.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21574/head:pull/21574 PR: https://git.openjdk.org/jdk/pull/21574
