message: [DWARFDIE] Rewrite `operator !=` using `operator ==`. NFCI.
diff: @@ -458,5 +458,5 @@ bool operator==(const DWARFDIE &lhs, const DWARFDIE &rhs) {
  }
  bool operator!=(const DWARFDIE &lhs, const DWARFDIE &rhs) {
  - return lhs.GetDIE() != rhs.GetDIE() || lhs.GetCU() != rhs.GetCU();
  + return !(lhs == rhs);
  }
  