[llvm] [AArch64][NFC] Add MCInstrAnalysis unittests (PR #155609)

[Pavel Iliin via llvm-commits]

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

Looks good overall, thank you for adding tests. It would be great to expand the set of instructions covered. I have added comments for the ones that seem to be missing. Also worth considering the pointer authentication forms of branches and returns.

https://github.com/llvm/llvm-project/pull/155609