[code-reflection] Integrated: Clean up support for boxing

[Maurizio Cimadamore]

On Tue, 30 Apr 2024 11:11:42 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This PR does a couple of things:
> * it sharpens the types of the various `JavaType` constants to the correct sealed sub-interface
> * it consolidates support for boxing/unboxing. More specifically there's now a pair of functions:
> 
> 
> ClassType::unbox() -> Optional<PrimitiveType>
> 
> 
> and
> 
> 
> PrimitiveType::box() -> Optional<ClassType>
> 
> 
> Note that both functions are partial: there are classes that are not wrappers (e.g. String) and there are primitive types that cannot be boxed (e.g. `void`).
> 
> I'm on the fence whether to use `Optional` for this, or just return null. Suggestions welcome.

This pull request has now been integrated.

Changeset: ac9bc55a
Author:    Maurizio Cimadamore <mcimadamore at openjdk.org>
URL:       https://git.openjdk.org/babylon/commit/ac9bc55a1fabfed9a7133156371b1133dfc42e4d
Stats:     100 lines in 5 files changed: 42 ins; 22 del; 36 mod

Clean up support for boxing

Reviewed-by: psandoz

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PR: https://git.openjdk.org/babylon/pull/67