RFR: JDK-8289551: Conversions between bit representations of half precision values and floats [v8]

[Joe Darcy]

> Initial implementation.

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

  Implement additional review feedback.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/9422/files
  - new: https://git.openjdk.org/jdk/pull/9422/files/6afaafbb..c4ded352

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9422&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9422&range=06-07

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9422.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9422/head:pull/9422

PR: https://git.openjdk.org/jdk/pull/9422