[PATCH 0/1] MR1244: Draft: ntdll/tests: Test syscall SSE register save / restore strategy.

[Rémi Bernon (＠rbernon)]

Showing that only non-volatile registers are reliably saved. Volatile
registers are only saved by NtGetContextThread whenever it interrupts
a thread in user space, and are otherwise returned from some previous,
possibly outdated, state.

@jacek Unless I'm missing something, I think this shows that we do not
have to save the full context in syscalls in general, and instead only
the non-volatile XMM registers?

NtGetContextThread syscall still probably needs to save the full context
and it should probably be using a specific code path.