SVN r345859: libxo broke netstat?

[Michael Butler]

Something changed in libxo that causes 'netstat -i' to segfault as below:

imb at toshi:/usr/src/usr.bin/netstat> lldb
/usr/obj/usr/src/amd64.amd64/usr.bin/netstat/netstat
(lldb) target create "/usr/obj/usr/src/amd64.amd64/usr.bin/netstat/netstat"
Current executable set to
'/usr/obj/usr/src/amd64.amd64/usr.bin/netstat/netstat' (x86_64).
(lldb) run -i
Process 65948 launching
Process 65948 launched:
'/usr/obj/usr/src/amd64.amd64/usr.bin/netstat/netstat' (x86_64)
Name    Mtu Network       Address              Ipkts Ierrs Idrop
Opkts Oerrs  Coll
Process 65948 stopped
* thread #1, name = 'netstat', stop reason = signal SIGSEGV: invalid
address (fault address: 0x0)
    frame #0: 0x00000008002987ad
libxo.so.0`___lldb_unnamed_symbol30$$libxo.so.0 + 669
libxo.so.0`___lldb_unnamed_symbol30$$libxo.so.0:
->  0x8002987ad <+669>: movsbl (%r12), %eax
    0x8002987b2 <+674>: movslq %eax, %rbx
    0x8002987b5 <+677>: movq   0xac04(%rip), %r13
    0x8002987bc <+684>: testl  %eax, %eax
(lldb) bt
* thread #1, name = 'netstat', stop reason = signal SIGSEGV: invalid
address (fault address: 0x0)
  * frame #0: 0x00000008002987ad
libxo.so.0`___lldb_unnamed_symbol30$$libxo.so.0 + 669
    frame #1: 0x0000000800294e09
libxo.so.0`___lldb_unnamed_symbol24$$libxo.so.0 + 1401
    frame #2: 0x0000000800293b91
libxo.so.0`___lldb_unnamed_symbol22$$libxo.so.0 + 609
    frame #3: 0x0000000800293df0 libxo.so.0`xo_emit + 256
    frame #4: 0x0000000000212dc5 netstat`intpr + 1669
    frame #5: 0x0000000000217ecf netstat`main + 2431
    frame #6: 0x000000000021210f netstat`__fini_array_end + 271