message: DWARFASTParserClang: Delete dead code
  This removes places where DW_AT_decl_file/line/column was being parsed,
  but not used.
diff: @@ -2481,7 +2481,6 @@ bool DWARFASTParserClang::ParseChildMembers(
  DWARFAttributes attributes;
  const size_t num_attributes = die.GetAttributes(attributes);
  if (num_attributes > 0) {
  - Declaration decl;
  const char *name = nullptr;
  const char *prop_name = nullptr;
  const char *prop_getter_name = nullptr;
  @@ -2505,16 +2504,6 @@ bool DWARFASTParserClang::ParseChildMembers(
  DWARFFormValue form_value;
  if (attributes.ExtractFormValueAtIndex(i, form_value)) {
  switch (attr) {
  - case DW_AT_decl_file:
  - decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex(
  - form_value.Unsigned()));
  - break;
  - case DW_AT_decl_line:
  - decl.SetLine(form_value.Unsigned());
  - break;
  - case DW_AT_decl_column:
  - decl.SetColumn(form_value.Unsigned());
  - break;
  case DW_AT_name:
  name = form_value.AsCString();
  break;
  @@ -2960,7 +2949,6 @@ bool DWARFASTParserClang::ParseChildMembers(
  DWARFAttributes attributes;
  const size_t num_attributes = die.GetAttributes(attributes);
  if (num_attributes > 0) {
  - Declaration decl;
  DWARFFormValue encoding_form;
  AccessType accessibility = default_accessibility;
  bool is_virtual = false;
  @@ -2972,16 +2960,6 @@ bool DWARFASTParserClang::ParseChildMembers(
  DWARFFormValue form_value;
  if (attributes.ExtractFormValueAtIndex(i, form_value)) {
  switch (attr) {
  - case DW_AT_decl_file:
  - decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex(
  - form_value.Unsigned()));
  - break;
  - case DW_AT_decl_line:
  - decl.SetLine(form_value.Unsigned());
  - break;
  - case DW_AT_decl_column:
  - decl.SetColumn(form_value.Unsigned());
  - break;
  case DW_AT_type:
  encoding_form = form_value;
  break;
  @@ -3105,7 +3083,6 @@ size_t DWARFASTParserClang::ParseChildParameters(
  const size_t num_attributes = die.GetAttributes(attributes);
  if (num_attributes > 0) {
  const char *name = nullptr;
  - Declaration decl;
  DWARFFormValue param_type_die_form;
  bool is_artificial = false;
  // one of None, Auto, Register, Extern, Static, PrivateExtern
  @@ -3117,16 +3094,6 @@ size_t DWARFASTParserClang::ParseChildParameters(
  DWARFFormValue form_value;
  if (attributes.ExtractFormValueAtIndex(i, form_value)) {
  switch (attr) {
  - case DW_AT_decl_file:
  - decl.SetFile(comp_unit.GetSupportFiles().GetFileSpecAtIndex(
  - form_value.Unsigned()));
  - break;
  - case DW_AT_decl_line:
  - decl.SetLine(form_value.Unsigned());
  - break;
  - case DW_AT_decl_column:
  - decl.SetColumn(form_value.Unsigned());
  - break;
  case DW_AT_name:
  name = form_value.AsCString();
  break;
  