[lldb] [llvm] [lldb][FreeBSD][AArch64] Enable register field detection (PR #85058)

[David Spickett via llvm-commits]

DavidSpickett wrote:

I'm currently assuming that the process classes will check those HWCAPs and only add those registers to the register info if they exist. This code only patches registers that are already in the info, it doesn't add any new ones.

That said, explicit is better than implicit, and I already have the HWCAP values to hand, so I will try checking them to see what should exist or not.

https://github.com/llvm/llvm-project/pull/85058