   0  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x000002aac15364f0> -> %r1
   4  setfield_gc_r %r1, %r0, FieldDescr<pypy.objspace.std.bufferobject.W_Buffer.inst_buf>
   9  ref_return %r1
