message: [XLA] Remove HloOpcodeProperty and kHloOpcodeIsComparison.
  These are not used anywhere. I suppose it was meant to be removed in cl/237318727.
diff: @@ -35,11 +35,6 @@ namespace xla {
  //
  // Each entry has the format:
  // (enum_name, opcode_name, arity)
  -// or
  -// (enum_name, opcode_name, arity, p1 | p2 | ...)
  -//
  -// with p1, p2, ... are members of HloOpcodeProperty. They are combined
  -// using bitwise-or.
  //
  // Note: Do not use ':' in opcode names. It is used as a special character
  // in these places:
  @@ -162,13 +157,6 @@ enum {
  kHloOpcodeIsVariadic = -1,
  };
  -// List of properties associated with opcodes.
  -// Properties are defined as increasing powers of two, so that we can use
  -// bitwise-or to combine properties, and bitwise-and to test for them.
  -enum HloOpcodeProperty {
  - kHloOpcodeIsComparison = 1 << 0,
  -};
  -
  // Returns a string representation of the opcode.
  string HloOpcodeString(HloOpcode opcode);
  