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

[Mourad Abbay]

On Mon, 5 Jan 2026 15:57:41 GMT, Adam Sotona <asotona at openjdk.org> wrote:

>> This patch fixes `bytecode/impl/LoweringTransform` with unboxing selector, implicit default target leading to exit block and conversion of constant labels.
>> Unreflect runs of `TestSwitchExpressionOp` and `TestSwitchStatementOp` are now enabled and pass.
>
> Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixed ConstantLabelSwitchOp javadoc and Character unboxing

Marked as reviewed by mabbay (Reviewer).

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PR Review: https://git.openjdk.org/babylon/pull/804#pullrequestreview-3627589279