Add witnesses and associated tests to Float16. -------------
Commit messages: - 8377322: Upgrade Float16 to use operators Changes: https://git.openjdk.org/valhalla/pull/2051/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2051&range=00 Stats: 190 lines in 3 files changed: 185 ins; 0 del; 5 mod Patch: https://git.openjdk.org/valhalla/pull/2051.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2051/head:pull/2051 PR: https://git.openjdk.org/valhalla/pull/2051
