[llvm] [AArch64] Use helper class for emitting CFI instructions into MIR (NFCI) (PR #136004)

[Daniel Hoekwater via llvm-commits]

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

Using the helper class is so much cleaner than manually building the CFI instructions, thank you for doing this!

https://github.com/llvm/llvm-project/pull/136004