RFR: 8372948: Store end positions directly in JCTree

[Jonathan Gibbons]

I'm not sure a shared interface gets you anything significant, since you cannot inherit a shared field that way.

Instead, you could have a `setEndPos` on `JCTree` that is a no-op on subtypes that do not need it, and which sets a locally declared field on subtypes that do need it.

-- Jon

On Tue, Dec 2, 2025, at 8:30 AM, Liam Miller-Cushon wrote:
> Good question--I hadn't investigated that option. It seems do-able, perhaps with a shared interface for subtypes that needed end positions to simplify the handling of them.
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