RFR: 8370922: Template Framework Library: Float16 type and operations [v4]

[Emanuel Peter]

> We should test `Float16` with Template Framework Tests. For this, I'm now implementing:
> 
> - Template Framework Library: add `Float16Type` that represents `Float16`. Extend `Operations.java` with `Float16` operations.
> - `Verify.java`: add verification for `Float16`, and corresponding tests in `TestVerifyIncubatorVector.java`. We could have done this separately, but it is not much code and completes the pipeline from code generation through execution and finally result verification in the following two tests.
> - Adding `Float16` to `ExpressionFuzzer.java` and `TestExpressions.java`.

Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:

  comments for Benoit

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28095/files
  - new: https://git.openjdk.org/jdk/pull/28095/files/78bd0cc0..8d0d7e7d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28095&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28095&range=02-03

  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28095.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28095/head:pull/28095

PR: https://git.openjdk.org/jdk/pull/28095