   0  getfield_gc_r_pure %r0, FieldDescr<pypy.module.thread.os_lock.Lock.inst_lock> -> %r1
   5  inline_call_ir_i <JitCode 'Lock.acquire'>, I[$True], R[%r1] -> %i0
  13  -live- %i0, %r0
  13  -live- %i0, %r0
  13  goto_if_not %i0, L1
  17  ref_return %r0
  19  ---
  19  L1:
  19  ref_return %r0
