[vectorIntrinsics+fp16] RFR: 8277304: Java support for FP16 [v6]

[Smita Kamath]

> Initial FP16 vectorAPI Java support.

Smita Kamath has updated the pull request incrementally with one additional commit since the last revision:

  Code cleanup

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Changes:
  - all: https://git.openjdk.org/panama-vector/pull/164/files
  - new: https://git.openjdk.org/panama-vector/pull/164/files/84033ba4..0d391f79

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=164&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=164&range=04-05

  Stats: 48 lines in 8 files changed: 8 ins; 16 del; 24 mod
  Patch: https://git.openjdk.org/panama-vector/pull/164.diff
  Fetch: git fetch https://git.openjdk.org/panama-vector pull/164/head:pull/164

PR: https://git.openjdk.org/panama-vector/pull/164