[clang] AArch64 Tablegen Update (PR #179692)

[David Spickett via cfe-commits]

DavidSpickett wrote:

Another check could be to compare header contents before and after. If this is a pure refactor then there should be no difference. If there are some differences, you can explain why they are expected.

I see the ACLE mentioned, so I am particularly interested in those headers.

https://github.com/llvm/llvm-project/pull/179692