Think Flow

1. tcg_livness_analysis, if opcode is qemu_ld or qemu_st, set all globals alive.
2. qemu_ld is OK now.
3. restore to morning status
4. qemu 1.01 can exit qemu when poweroff
5. chaos
6. qemu_st, fail, no output, trap in some sort of loops?
7. just forget what I'm going to do after viewing some web pages....
8.