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

[Gergely Bálint via llvm-commits]

bgergely0 wrote:

Thanks for the approval @ilinpv, can I ask you to merge this as well? I don't have the rights to do so.

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