RFR: 8369123: Still more small Float16 refactorings [v4]

[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 incrementally with one additional commit since the last revision:

  Respond to review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27625/files
  - new: https://git.openjdk.org/jdk/pull/27625/files/458bf671..197dbfed

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27625&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27625&range=02-03

  Stats: 17 lines in 1 file changed: 13 ins; 0 del; 4 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