[PATCH 0/4] MR850: server: Fix debug register getting/setting on macOS.

[Brendan Shanks (＠bshanks)]

- On macOS, add error reporting when getting/setting debug registers.
- Also, as in ptrace.c, use context->machine to determine which context struct to read/write.
- And when setting, ensure that the correct debug state flavor is used (needed for Wow64)

The debug register tests should now pass on Mojave and Monterey, for 32- and 64-bit.

Note that Rosetta 2 on Apple Silicon mostly doesn't emulate debug registers, and the tests fail there.