message: [lldb][NFC] Minor fixes for lldb_private::DiagnosticManager
diff: @@ -106,7 +106,7 @@ public:
  }
  }
  - bool HasFixIts() {
  + bool HasFixIts() const {
  for (Diagnostic *diag : m_diagnostics) {
  if (diag->HasFixIts())
  return true;
  @@ -130,10 +130,9 @@ public:
  void PutString(DiagnosticSeverity severity, llvm::StringRef str);
  void AppendMessageToDiagnostic(llvm::StringRef str) {
  - if (!m_diagnostics.empty()) {
  + if (!m_diagnostics.empty())
  m_diagnostics.back()->AppendMessage(str);
  }
  - }
  // Returns a string containing errors in this format:
  //
  @@ -149,7 +148,6 @@ public:
  // Moves fixed_expression to the internal storage.
  void SetFixedExpression(std::string fixed_expression) {
  m_fixed_expression = std::move(fixed_expression);
  - fixed_expression.clear();
  }
  protected:
  