[lldb] [llvm] [lldb][AArch64][Linux] Handle SME only and kernels < 6.19 (PR #189982)

[David Spickett via llvm-commits]

DavidSpickett wrote:

I don't know how much use code review is going to be here, given that I'm the only one with the full context in my head (I don't recommend it).

However, I'm sure there's some wording to be improved and a few spelling mistakes to fix.

https://github.com/llvm/llvm-project/pull/189982