[foreign-memaccess+abi] RFR: Split Stream operations, fix final and class properties [v3]

[Per Minborg]

On Tue, 20 Sep 2022 14:50:12 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Revert some more final declarations
>
> src/java.base/share/classes/jdk/internal/foreign/abi/UpcallLinker.java line 64:
> 
>> 62:     }
>> 63: 
>> 64:     private UpcallLinker() {
> 
> This doesn't buy much since it's internal API.

I think it is good practice anyhow. This signals that it is an uninstantiable utility class.

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PR: https://git.openjdk.org/panama-foreign/pull/724