[llvm] [AArch64] improve zero-cycle regmov test (PR #143680)

[Tomer Shafir via llvm-commits]

tomershafir wrote:

v5:
- Change return type from `i32` to `void`
- Check exact sequence of all the instructions via `*-NEXT`ing all

https://github.com/llvm/llvm-project/pull/143680