[Bug symtab/25969] Ignoring .debug_aranges with clang .debug_names

["sourav0311 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25969

Sourabh Singh Tomar <sourav0311 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sourav0311 at gmail dot com

--- Comment #2 from Sourabh Singh Tomar <sourav0311 at gmail dot com> ---
GDB when trying to parse `debug_names` also parses `debug_aranges`
section, however `debug_aranges` section is not generated/present
in `clang-trunk` generated executables. This warning is the result
of GDB not checking whether the section is even present/empty.

clang version 12.0.0

$clang -gdwarf-5 -gpubnames test.c
$readelf -S a.out | awk /debug/
  [24] .debug_abbrev     PROGBITS         0000000000000000  000009a4
  [25] .debug_info       PROGBITS         0000000000000000  000009ed
  [26] .debug_str_offset PROGBITS         0000000000000000  00000a46
  [27] .debug_str        PROGBITS         0000000000000000  00000a6e
  [28] .debug_addr       PROGBITS         0000000000000000  00000af5
  [29] .debug_names      PROGBITS         0000000000000000  00000b08
  [30] .debug_line       PROGBITS         0000000000000000  00000b78
  [31] .debug_line_str   PROGBITS         0000000000000000  00000be1


A quick fix could be:
```
static void
create_addrmap_from_aranges (dwarf2_per_objfile *per_objfile,
                             struct dwarf2_section_info *section)
{
  /*If section is empty(or not present) bail out early.*/
  if (section->empty ())
    return;
```

Because anyway we are bailing out after emitting the warning:
```
if (!insertpair.second)
        {
          warning (_("Section .debug_aranges in %s has duplicate "
                     "debug_info_offset %s, ignoring .debug_aranges."),
                   objfile_name (objfile), sect_offset_str (per_cu->sect_off));
          return;
        }
```

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