[vectorIntrinsics+fp16] RFR: 8277304: Java support for FP16 [v3]

[Smita Kamath]

> Initial FP16 vectorAPI Java support.

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

  Modified gen-src to add Halffloat as new element type. This change removes redundant code from classes

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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/89c872d4..2479ce46

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=164&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=164&range=01-02

  Stats: 298 lines in 6 files changed: 5 ins; 269 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