message: Add HLO matcher for the tuple-select HLO.
diff: @@ -231,6 +231,7 @@ HLO_MATCHER(Tanh);
  HLO_MATCHER(Trace);
  HLO_MATCHER(Transpose);
  HLO_MATCHER(Tuple);
  +HLO_MATCHER(TupleSelect);
  HLO_MATCHER(While);
  // The special cases below let you check additional information about the
  