RFR: 8315942: Sort platform enums and definitions after JDK-8304913 follow-ups

[Roger Riggs]

On Fri, 8 Sep 2023 15:31:02 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> @RogerRiggs asked for this. The moves are mechanical, so nothing should be lost. Tell me if other things need to be sorted as well.
> 
> I would wait a little to see if there are any more JDK-8304913 followups.

LGTM, thanks

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15640#pullrequestreview-1617813671