RFR: 8308960: Decouple internal Version and OperatingSystem classes

[Mandy Chung]

On Fri, 26 May 2023 14:57:21 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Decouple the jdk.internal.util OperatingSystem and Version classes to simplify class loading and avoid an indirect cyclic initialization.
> 
> Move the method to get the current OS version from OperatingSystem to the Version class and its initialization.
> Revert to using String.toUpperCase() instead of custom code to uppercase.
> 
> Update the uses of OperatingSystem.version to be Version.current.

I mean static member class of `OperatingSystem`.

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PR Comment: https://git.openjdk.org/jdk/pull/14181#issuecomment-1564637892