lguest: suppress interrupts for single insn, not range.

The last patch reduced our interrupt-suppression region to one address,
so simplify the code somewhat.

Also, remove the obsolete undefined instruction ranges and the comment
which refers to lguest_guest.S instead of head_32.S.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --cc arch/x86/include/asm/lguest.h
Simple merge

diff --cc arch/x86/lguest/boot.c
Simple merge

diff --cc arch/x86/lguest/head_32.S
Simple merge

diff --cc drivers/lguest/hypercalls.c
Simple merge

diff --cc drivers/lguest/interrupts_and_traps.c
Simple merge

diff --cc drivers/lguest/lg.h
Simple merge

diff --cc include/linux/lguest.h
Simple merge