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

[David Spickett via llvm-commits]

DavidSpickett wrote:

This is a stacked PR, the first two commits are https://github.com/llvm/llvm-project/pull/84147 and https://github.com/llvm/llvm-project/pull/85057.

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