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

[Paul Sandoz]

On Fri, 5 Aug 2022 21:58:40 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Please add JMH microbenchmark and show results.

Also please update the unit tests to run with and without the intrinsics enabled.

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