[llvm] [AArch64][llvm] Unify AArch64 tests into a single file (1/4) (NFC) (PR #146328)

[Tomas Matheson via llvm-commits]

tmatheson-arm wrote:

This series looks really good, thanks for working on it. Have all the tests been automatically converted or was it a manual process? How confident can we be that nothing has been missed in the conversion process?

https://github.com/llvm/llvm-project/pull/146328