[Bug default/27463] New: [dwz] Unhandled DW_FORM_sdata for DW_AT_decl_line

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27463

            Bug ID: 27463
           Summary: [dwz] Unhandled DW_FORM_sdata for DW_AT_decl_line
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

Regression since commit 4100572 "Handle DW_FORM_implicit_const for
DW_AT_decl_line".

With the gdb regression testsuite, using target board cc-with-dwz, we run into:
...
$ dwz
build/gdb/testsuite/outputs/gdb.trace/unavailable-dwarf-piece/unavailable-dwarf-piece
-o z
dwz: unavailable-dwarf-piece: Unhandled DW_FORM_sdata for DW_AT_decl_line
...

The commit added this code:
...
          switch (form)
            {
            case DW_FORM_data1: value = read_8 (ptr); handled = true; break;
            case DW_FORM_data2: value = read_16 (ptr); handled = true; break;
            case DW_FORM_data4: value = read_32 (ptr); handled = true; break;
            case DW_FORM_data8: value = read_64 (ptr); handled = true; break;
            case DW_FORM_udata:
              value = read_uleb128 (ptr); handled = true; break;
            case DW_FORM_implicit_const:
              value = t->values[i]; handled = true; break;
            default:
              error (0, 0, "%s: Unhandled %s for %s",
                     dso->filename, get_DW_FORM_str (form),
                     get_DW_AT_str (t->attr[i].attr));
              return 1;
            }
...
and the error case triggers.

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