RFR: 8369123: Still more small Float16 refactorings [v3]

[Joe Darcy]

> Upon further inspection, found a few more opportunities to refine the use of constants in the Float16 implementation.

Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into JDK-8369123
 - Remove unneeded use of "Float16.".
 - JDK-8369123: Still more small Float16 refactorings

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27625/files
  - new: https://git.openjdk.org/jdk/pull/27625/files/be2b4ab8..458bf671

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27625&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27625&range=01-02

  Stats: 6331 lines in 282 files changed: 3820 ins; 1144 del; 1367 mod
  Patch: https://git.openjdk.org/jdk/pull/27625.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27625/head:pull/27625

PR: https://git.openjdk.org/jdk/pull/27625