RFR: 8297830: aarch64: Make Address a discriminated union internally [v2]

[Kim Barrett]

On Wed, 30 Nov 2022 18:15:35 GMT, Andrew Haley <aph at openjdk.org> wrote:

>>> OK, thanks. It does seem to me a bit like moving the furniture around, but I have to admit it's an improvement. :-)
>> 
>> The driver for all these cleanups around aarch64 Address is that when I tried to fix JDK-8160404 I got (valid) compiler warnings here about UB.
>
>> The driver for all these cleanups around aarch64 Address is that when I tried to fix JDK-8160404 I got (valid) compiler warnings here about UB.
> 
> Aha! Thanks. It's good to have that here, in the discussion.

Thanks for reviews @theRealAph and @dcubed-ojdk .

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PR: https://git.openjdk.org/jdk/pull/11429