   0  getfield_gc_r %r0, FieldDescr<pypy.objspace.std.bufferobject.W_Buffer.inst_buf> -> %r0
   5  -live- %r0
   5  guard_class %r0 -> %i0
   8  getfield_raw_i %i0, FieldDescr<rpython.rlib.buffer.Buffer_vtable.cls_as_str> -> %i0
  13  -live- %i0, %r0
  13  switch %i0, <SwitchDictDescr 0:L1, 1:L2, 2:L3>
  17  unreachable
  18  ---
  18  L1:
  18  -live- %r0
  18  getfield_gc_r_pure %r0, FieldDescr<rpython.rlib.buffer.StringBuffer.inst_value> -> %r0
  23  ref_return %r0
  25  ---
  25  L2:
  25  -live-
  25  raise $<* struct object>
  27  ---
  27  L3:
  27  -live- %r0
  27  inline_call_r_r <JitCode 'Buffer.as_str'>, R[%r0] -> %r0
  33  -live- %r0
  33  ref_return %r0
