Update Bfloat16 to use operators; small adjustment to StandardFloatingPoint
------------- Commit messages: - Refine StandardFloatingPoint; upgrade Bfloat16 for operators. - Merge branch 'type-classes' into JDK-8376250 - JDK-8376250: Upgrade Bfloat16 to use operators Changes: https://git.openjdk.org/valhalla/pull/1958/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1958&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8376250 Stats: 205 lines in 5 files changed: 199 ins; 0 del; 6 mod Patch: https://git.openjdk.org/valhalla/pull/1958.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1958/head:pull/1958 PR: https://git.openjdk.org/valhalla/pull/1958
