RFR: 8298088: RISC-V: Make Address a discriminated union internally [v2]

[Fei Yang]

On Mon, 5 Dec 2022 13:41:30 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

>> Fei Yang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Review
>
> Nice cleanup! With one comment:

@feilongjiang @yadongw : Thanks for the review! @shipilev : Want to take a look?

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PR: https://git.openjdk.org/jdk/pull/11505