[lworld+fp16] RFR: 8329817: Augment prototype Float16 class [v2]

[Joe Darcy]

> Sketch of a more full-featured API for Float16.

Joe Darcy has updated the pull request incrementally with two additional commits since the last revision:

 - Add @value tags to javadoc.
 - Adjust list of possible future work.

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1117/files
  - new: https://git.openjdk.org/valhalla/pull/1117/files/c4dbf5b9..dc31ccfb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1117&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1117&range=00-01

  Stats: 16 lines in 1 file changed: 7 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/valhalla/pull/1117.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1117/head:pull/1117

PR: https://git.openjdk.org/valhalla/pull/1117