[code-reflection] RFR: Switch lowering fixes [v2]

[Adam Sotona]

On Mon, 5 Jan 2026 16:01:25 GMT, Mourad Abbay <mabbay at openjdk.org> wrote:

>> I found wrongly unboxing `Character` - will fix it.
>
> should the labels be primitives as as well ?

This lowering is still far from the javac lowering of switch statements and expressions and there are many places to improve. These fixes cover only failures of the current unreflected tests.

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PR Review Comment: https://git.openjdk.org/babylon/pull/804#discussion_r2662006540