   0  getfield_gc_r %r0, FieldDescr<pypy.objspace.std.dictproxyobject.W_DictProxyObject.inst_w_mapping> -> %r0
   5  inline_call_r_r <JitCode 'len'>, R[%r0] -> %r0
  11  -live- %r0
  14  ref_return %r0
