[PATCH][gdb/tdep] Handle mxcsr kernel bug on Intel Skylake CPUs

[Tom Tromey]

>>>>> "Tom" == Tom de Vries <tdevries@suse.de> writes:

Tom> [gdb/tdep] Handle mxcsr kernel bug on Intel Skylake CPUs

Tom> gdb/ChangeLog:

Tom> 2019-09-24  Tom de Vries  <tdevries@suse.de>

Tom> 	PR gdb/23815
Tom> 	* amd64-linux-nat.c (amd64_linux_nat_target::fetch_registers):
Tom> 	Initialize xstateregs before ptrace PTRACE_GETREGSET call.

Thanks for the patch.

I think this is reasonable, but it could use a comment before the memset
explaining why it is there.  Maybe some future gdb hacker will want to
remove the memset, and a comment would explain why not to, or when it
would be ok to.

thanks,
Tom