[Bug symtab/25953] [debug-names] Support multiple per-CU indices

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

https://sourceware.org/bugzilla/show_bug.cgi?id=25953

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
The section contains two per-CU indices:
...
$ llvm-dwarfdump --all a.out
  ...
.debug_names contents:
Name Index @ 0x0 {
  Header {
    Length: 0x6C
    Version: 5
    Padding: 0x0
    CU count: 1
    Local TU count: 0
    Foreign TU count: 0
    Bucket count: 2
    Name count: 2
    Abbreviations table size: 0xD
    Augmentation: 'LLVM0700'
  }
  Compilation Unit offsets [
    CU[0]: 0x000000c7
  ]
  Abbreviations [
    Abbreviation 0x2e {
      Tag: DW_TAG_subprogram
      DW_IDX_die_offset: DW_FORM_ref4
    }
    Abbreviation 0x24 {
      Tag: DW_TAG_base_type
      DW_IDX_die_offset: DW_FORM_ref4
    }
  ]
  Bucket 0 [
    Name 1 {
      Hash: 0xB888030
      String: 0x00000061 "int"
      Entry @ 0x5d {
        Abbrev: 0x24
        Tag: DW_TAG_base_type
        DW_IDX_die_offset: 0x00000032
      }
    }
    Name 2 {
      Hash: 0x7C9A7F6A
      String: 0x0000020c "main"
      Entry @ 0x66 {
        Abbrev: 0x2E
        Tag: DW_TAG_subprogram
        DW_IDX_die_offset: 0x00000023
      }
    }
  ]
  Bucket 1 [
    EMPTY
  ]
}
Name Index @ 0x70 {
  Header {
    Length: 0x4C
    Version: 5
    Padding: 0x0
    CU count: 1
    Local TU count: 0
    Foreign TU count: 0
    Bucket count: 1
    Name count: 1
    Abbreviations table size: 0x7
    Augmentation: 'LLVM0700'
  }
  Compilation Unit offsets [
    CU[0]: 0x000000fe
  ]
  Abbreviations [
    Abbreviation 0x2e {
      Tag: DW_TAG_subprogram
      DW_IDX_die_offset: DW_FORM_ref4
    }
  ]
  Bucket 0 [
    Name 1 {
      Hash: 0xB887389
      String: 0x00000217 "foo"
      Entry @ 0xb7 {
        Abbrev: 0x2E
        Tag: DW_TAG_subprogram
        DW_IDX_die_offset: 0x00000023
      }
    }
  ]
}
...

But gdb expects a single per-module index.

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