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

[Roger Riggs]

On Tue, 5 Aug 2025 16:04:08 GMT, Chen Liang <liach at openjdk.org> wrote:

>> Provide a general facility for our null check APIs like Objects::requireNonNull or future Checks::nullCheck (void), converting the existing infrastructure to start tracking from a given stack site (depth offset) and a given stack slot (offset value).
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update NPE per roger review

A hotspot and 2 core-libs reviewers should have a chance to comment.

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PR Comment: https://git.openjdk.org/jdk/pull/26600#issuecomment-3161228199