When doing a soft int, we need to bump eip before pushing it to
the stack.  Otherwise we'll do the int a second time.

[apw@canonical.com: merged eip update as per Jan's recommendation.]
Signed-off-by: NSerge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: NAndy Whitcroft <apw@canonical.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>