RFR: 8300253: Introduce AArch64 nzcv accessors [v3]

[Andrew Haley]

On Mon, 23 Jan 2023 10:22:30 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> Some code, such as verification code, might want to run without changing the state of the system. To do that, it's useful to be able to get and set the nzcv flags. This enhancement aims at adding accessors for that.
>
> Erik Österlund has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix test

OK.

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Marked as reviewed by aph (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12038