[llvm] [AArch64] Refactor @plt, @gotpcrel, and @AUTH to use parseDataExpr (PR #134202)

[Peter Smith via llvm-commits]

https://github.com/smithp35 approved this pull request.

Thanks for answering the questions. This looks good to me, and should only have an effect on incorrect inputs.

As with the other changes in this series, please leave a day or two for other reviewers to comment.

https://github.com/llvm/llvm-project/pull/134202