RFR: 8335905: CompoundElement API cleanup [v2]

[Chen Liang]

On Tue, 9 Jul 2024 23:29:28 GMT, Chen Liang <liach at openjdk.org> wrote:

>> `CompoundElement` already inherits `Iterable` and its `forEach(Consumer)`, thus we can remove `Iterable elements()` and `forEachElements(Consumer)`.
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Two usages in tier3

Thanks for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/20103#issuecomment-2227378896