RFR: 8304146: Refactor VisibleMemberTable (LocalMemberTable) [v2]

[Chen Liang]

On Wed, 15 Mar 2023 18:54:02 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> I don't mind either way; @jonathan-gibbons do you have a preference?
>
> TANSTAAFL
> 
> I suggest to leave the code as-is.

True, my previous suggestion is largely trivial.

In addition, I suggest to run `replaceAll` to ensure the map elements of each value of `namedMembers` is unmodifiable as well:

namedMembers.replaceAll((k, m) -> {
    m.replaceAll((n, members) -> Collections.unmodifiableList(members));
    return Collections.unmodifiableMap(m);
});

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PR: https://git.openjdk.org/jdk/pull/13044