RFR: 8289743: AArch64: Clean up patching logic [v2]

[David Holmes]

On Mon, 11 Jul 2022 16:33:50 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> The current logic for patching is a mess of if-then-elses. By rearranging the logic and using a switch we can make it both easier to understand and faster.
>
> Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8289743: AArch64: Clean up patching logic

I re-ran our tests and they are now passing. Thanks.

-------------

PR: https://git.openjdk.org/jdk/pull/9398