message: Add SUM spec
diff: @@ -368,6 +368,16 @@ SUB
  range : [-128, 127]
  granularity: per-tensor
  +SUM
  + Input 0:
  + data_type : int8
  + range : [-128, 127]
  + granularity: per-tensor
  + Output 0:
  + data_type : int8
  + range : [-128, 127]
  + granularity: per-tensor
  +
  SQUEEZE
  Input 0:
  data_type : int8
  