message: [SymbolFile] SymbolFileDWARF::ParseLineTable should lock its module
  As of svn rL367298, SymbolFileDWARF locks the module in many cases where
  it needs to parse some aspect of the DWARF symbol file.
  SymbolFileDWARF::ParseLineTable needs to lock the module because
  SymbolVendor::ParseLineTable no longer locks it.
diff: @@ -928,7 +928,7 @@ static void ParseDWARFLineTableCallback(dw_offset_t offset,
  }
  bool SymbolFileDWARF::ParseLineTable(CompileUnit &comp_unit) {
  - ASSERT_MODULE_LOCK(this);
  + std::lock_guard<std::recursive_mutex> guard(GetModuleMutex());
  if (comp_unit.GetLineTable() != nullptr)
  return true;
  