Added instr callbacks for sysenter/sysexit/syscall/sysret
Added instr callbacks for sysenter/sysexit/syscall/sysret

dbrashear/bochs,dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs,dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dariaphoebe/bochs