[lworld] RFR: 8373930: [lworld] Restore Objects.equals use of identity check [v2]

[Chen Liang]

On Fri, 9 Jan 2026 21:33:27 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Revert "8366841: [lworld] Objects.equals without identity comparison".  (Almost all)
>> Removing the condition on --enable-preview.
>> Correct the .equals method in test SimplValueGraphs.SimpleValue.
>
> Roger Riggs has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Reverted to remove the no longer unnecessary @ForceInline.
>    Update copyright.
>  - Merge branch 'lworld' into 8373930-objects-equals-revert
>  - Restore the mainline implementation of Objects.equal
>    removing the condition on --enable-preview.
>    Correct the .equals method of SimplValueGraphs.SimpleValue.
>    Revert "8366841: [lworld] Objects.equals without identity comparison"

Marked as reviewed by liach (Committer).

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PR Review: https://git.openjdk.org/valhalla/pull/1836#pullrequestreview-3653100511