[lworld+fp16] RFR: 8334432: Refine Float16.fma [v7]

[Joe Darcy]

> Adding comments and test cases for Float16.fma.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Respond to review feedback.

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1143/files
  - new: https://git.openjdk.org/valhalla/pull/1143/files/f3ceea16..172eea95

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1143&range=06
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1143&range=05-06

  Stats: 50 lines in 2 files changed: 10 ins; 10 del; 30 mod
  Patch: https://git.openjdk.org/valhalla/pull/1143.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1143/head:pull/1143

PR: https://git.openjdk.org/valhalla/pull/1143