RFR: 8316493: Make immutable maps @ValueBased [v3]

[Per Minborg]

On Fri, 22 Sep 2023 15:31:13 GMT, Chen Liang <liach at openjdk.org> wrote:

>> src/java.base/share/classes/java/util/AbstractMap.java line 524:
>> 
>>> 522:     protected Object clone() throws CloneNotSupportedException {
>>> 523:         AbstractMap<?,?> result = (AbstractMap<?,?>)super.clone();
>>> 524:         return result;
>> 
>> Suggestion:
>> 
>>         return super.clone();
>
> Since this base class has no more fields, this method should probably be removed and its spec change included as part of the CSR.

The method has been removed and the spec change has been incorporated into the CSR.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15614#discussion_r1364068379