RFR: 8355022: Implement JEP 506: Scoped Values [v7]

[Alan Bateman]

On Thu, 8 May 2025 17:33:09 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Propose to finalize scoped values.
>> The only functional change is that the orElse() method no longer accepts a null argument.
>
> Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix merge

Marked as reviewed by alanb (Reviewer).

I ran tier1-6 so I think we are good and there isn't anything left to bring over from the loom repo. There are a few files that will need their copyright header updated before integration. The CSR also needs to be finalized.

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PR Review: https://git.openjdk.org/jdk/pull/24923#pullrequestreview-2831452149
PR Comment: https://git.openjdk.org/jdk/pull/24923#issuecomment-2870007648