RFR: 8289552: Make intrinsic conversions between bit representations of half precision values and floats [v3]

[Smita Kamath]

> 8289552: Make intrinsic conversions between bit representations of half precision values and floats

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

  Addressed review comments, updated test cases and microbenchmark

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9781/files
  - new: https://git.openjdk.org/jdk/pull/9781/files/bcbc2f56..0f51243a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9781&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9781&range=01-02

  Stats: 75 lines in 11 files changed: 14 ins; 28 del; 33 mod
  Patch: https://git.openjdk.org/jdk/pull/9781.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9781/head:pull/9781

PR: https://git.openjdk.org/jdk/pull/9781