RFR: 8364588: Export the NPE backtracking functionality to general null-checking APIs [v4]

[Roger Riggs]

On Tue, 5 Aug 2025 15:01:49 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Don't add APIs without uses; it speculative and the API may not be what is really needed.
>
> Should I open a dependent PR to prove that this is exactly what we need to unblock [Objects::requireNonNull message enhancements](https://bugs.openjdk.org/browse/JDK-8233268)?

Please update the description to note this is a pre-requsite for:
[JDK-8233268](https://bugs.openjdk.org/browse/JDK-8233268) Improve integration of Objects.requireNonNull and JEP 358 Helpful NPE

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PR Review Comment: https://git.openjdk.org/jdk/pull/26600#discussion_r2257996201