[lworld] RFR: 8366214: [lworld] Use Objects.equals in HashMap and ConcurrentHashmap

[Chen Liang]

On Fri, 29 Aug 2025 03:20:57 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> I think your current logic differs when `e.key == null` and `k == null` - previously it evaluates to true, now this test fails.
>
> True, but to get here `k != null`. (line 678)

Indeed, forgot this file is CHM; thought this one was the regular HM.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1536#discussion_r2309080557