RFR: 8370922: Template Framework Library: Float16 type and operations [v2]

[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 with a new target base due to a merge or a rebase. The pull request now contains 15 commits:

 - merge with master
 - add more flags again
 - add module to compilation
 - Merge branch 'master' into JDK-8370922-TemplateFramework-Library-Float16
 - remove old TODOs
 - add Float16 to ExpressionFuzzer.java
 - fix jtreg commands
 - remove some unnecessary incubator flags
 - comparisons
 - rest of Float16 operators
 - ... and 5 more: https://git.openjdk.org/jdk/compare/dc1b0b5f...c7da6b4d

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Changes: https://git.openjdk.org/jdk/pull/28095/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28095&range=01
  Stats: 376 lines in 9 files changed: 348 ins; 4 del; 24 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