   0  getarrayitem_raw_i %i0, $0, <rpython.jit.backend.llsupport.descr.ArrayDescr object at 0x0000aaab0d2eb7c0> -> %i0
   6  newstr $1 -> %r0
   9  strsetitem %r0, $0, %i0
  13  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x0000aaab0cb26aa0> -> %r1
  17  setfield_gc_r %r1, %r0, FieldDescr<pypy.objspace.std.bytesobject.W_BytesObject.inst__value>
  22  ref_return %r1
