[vectorIntrinsics+fp16] RFR: 8290872: Extend panama-vector test automation for FP16 support

[Swati Sharma]

Hi All,

This PR includes generation script and template changes to support operations over Halffloat vector. The new test points have been added to cover the existing Halffloat binary operations support, and plan to incrementally increase the test coverage.
Please review and provide your feedback.

Thanks,
Swati Sharma

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Commit messages:
 - 8290872: Extend panama-vector test automation for FP16 support

Changes: https://git.openjdk.org/panama-vector/pull/205/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-vector&pr=205&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290872
  Stats: 12473 lines in 16 files changed: 12094 ins; 111 del; 268 mod
  Patch: https://git.openjdk.org/panama-vector/pull/205.diff
  Fetch: git fetch https://git.openjdk.org/panama-vector pull/205/head:pull/205

PR: https://git.openjdk.org/panama-vector/pull/205