RFR: 8355022: Implement JEP 506: Scoped Values [v3]

[ExE Boss]

On Tue, 29 Apr 2025 07:54:23 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:
> 
>   Since when?

src/java.base/share/classes/java/lang/ScopedValue.java line 1:

> 1: /*

It occurred to me that `ScopedValue.NEW_THREAD_BINDINGS` can be made package‑private and used in `Thread`, removing duplication in `Thread.NEW_THREAD_BINDINGS`.

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This was done this way back when `ScopedValue` lived under the `jdk.incubator.*` package tree.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24923#discussion_r2071516117