RFR: 8370922: Template Framework Library: Float16 type and operations

[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`.

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Commit messages:
 - 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
 - verify for Float16
 - ... and 4 more: https://git.openjdk.org/jdk/compare/08c16c38...c87acd90

Changes: https://git.openjdk.org/jdk/pull/28095/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28095&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370922
  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