[clang] [CIR] Add AArch64TargetCIRGenInfo (PR #215424)

[Andrzej Warzyński via cfe-commits]

https://github.com/banach-space commented:

There's a bit of fine detail here and IMO both reviewing and maintenance become easier if the test input/output are defined only once for all lowering configurations (within reason). Would it be possible to re-use the existing tests?
* https://github.com/llvm/llvm-project/blob/main/clang/test/CodeGen/AArch64/sme-inline-callees-streaming-attrs.c?

Thank you!

https://github.com/llvm/llvm-project/pull/215424