RFR: 8321287: Remove unused enum style in Prefetch

[Albert Mingkun Yang]

On Mon, 4 Dec 2023 17:27:59 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/16955#issuecomment-1851532335