RFR: 8372460: Use EnumMap instead of HashMap for DateTimeFormatter parsing to improve performance [v4]

[Naoto Sato]

On Mon, 1 Dec 2025 14:12:42 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Since non-ChronoField is very unlikely, I'd suggest a more localized change confined to Parsed.

+1. Never seen non-ChronoField in the wild

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PR Comment: https://git.openjdk.org/jdk/pull/28471#issuecomment-3597853861