RFR: 8289743: AArch64: Clean up patching logic

[David Holmes]

On Wed, 6 Jul 2022 13:28:06 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.

To be on the safe side I'm putting this through our internal testing. Please hold off integrating until I give it the green light. Thanks.

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