[lworld+fp16] RFR: 8345053: Add support for FP16 valueOf routines [v3]

[Bhavana Kilambi]

> This patch adds intrinsic support for Float16.valueOf() routines - conversions from int/long/double to half float.

Bhavana Kilambi has updated the pull request incrementally with one additional commit since the last revision:

  Address review comments

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1332/files
  - new: https://git.openjdk.org/valhalla/pull/1332/files/f7b98148..eeb2afe8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1332&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1332&range=01-02

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/1332.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1332/head:pull/1332

PR: https://git.openjdk.org/valhalla/pull/1332