message: Fix a bug when printing fusion_kind in hlo_graph_dumper.
diff: @@ -1003,7 +1003,7 @@ string HloDotDumper::GetInstructionNodeLabel(const HloInstruction* instr) {
  }
  string extended_opcode =
  StrCat(HloOpcodeString(instr->opcode()),
  - instr->opcode() == HloOpcode::kFusion
  + instr->opcode() != HloOpcode::kFusion
  ? ""
  : StrCat(":", xla::ToString(instr->fusion_kind())));
  // If the name does not contain the opcode, render both.
  