[clang] [llvm] [AArch64] Add the Ampere1B core (PR #81297)

[Jonathan Thackray via cfe-commits]

jthackray wrote:

> The clang-format failures are caused by preexisting/unchanged code. All newly added code passes clang-format.

Yes, I had this issue when I landed new cores previously. This whole file needs an NFC clang-format cleanup, IMHO.

https://github.com/llvm/llvm-project/pull/81297