KVM: x86 emulator: fix access registers for instructions with ModR/M byte and Mod = 3

KVM: x86 emulator: fix access registers for instructions with ModR/M byte and Mod = 3

patch 4e62417bf317504c0b85e0d7abd236f334f54eaf in mainline.

The patch belows changes the access type to register from memory for
instructions that are declared as SrcMem or DstMem, but have a
ModR/M byte with Mod = 3.

It fixes (at least) the lmsw and smsw instructions on an AMD64 CPU,
which are needed for FreeBSD.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>