[vectorIntrinsics+fp16] RFR: 8290204: FP16 initial backend implementation [v9]

[Smita Kamath]

> Initial backend implementation for enabling FP16.

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

  fix for build failures

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

Changes:
  - all: https://git.openjdk.org/panama-vector/pull/204/files
  - new: https://git.openjdk.org/panama-vector/pull/204/files/65a9e19e..399b6d27

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=panama-vector&pr=204&range=08
 - incr: https://webrevs.openjdk.org/?repo=panama-vector&pr=204&range=07-08

  Stats: 25 lines in 1 file changed: 25 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/panama-vector/pull/204.diff
  Fetch: git fetch https://git.openjdk.org/panama-vector pull/204/head:pull/204

PR: https://git.openjdk.org/panama-vector/pull/204