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

This extends the existing register fields support from AArch64 Linux
to AArch64 FreeBSD. So you will now see output like this:
```
(lldb) register read cpsr
    cpsr = 0x60000200
         = (N = 0, Z = 1, C = 1, V = 0, DIT = 0, SS = 0, IL = 0, SSBS = 0, D = 1, A = 0, I = 0, F = 0, nRW = 0, EL = 0, SP = 0) 
```

Linux and FreeBSD both have HWCAP/HWCAP2 so the detection mechanism
is the same and I've renamed the detector class to reflect that.

I have confirmed that FreeBSD's treatment of CPSR (spsr as the kernel
calls it) is similair enough that we can use the same field information.

(see `sys/arm64/include/armreg.h` and `PSR_SETTABLE_64`)

For testing I've enabled the same live process test as Linux
and added a shell test using an existing FreeBSD core file.

Note that the latter does not need XML support because when reading
a core file we are not sending the information via target.xml,
it's just internal to LLDB.

0 files changed, 0 insertions, 0 deletions