[Bug default/27212] ./dwz: xxx: Invalid DW_AT_decl_file file number 20

["jakub at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27212

--- Comment #3 from Jakub Jelinek <jakub at redhat dot com> ---
So we have in gencheck's .debug_abbrev:
   7      DW_TAG_variable    [no children]
    DW_AT_name         DW_FORM_strp
    DW_AT_decl_file    DW_FORM_implicit_const: 20
    DW_AT_decl_line    DW_FORM_data2
    DW_AT_decl_column  DW_FORM_implicit_const: 24
    DW_AT_type         DW_FORM_ref4
    DW_AT value: 0     DW_FORM value: 0
and in .debug_info:
 <1><1223>: Abbrev Number: 7 (DW_TAG_variable)
    <1224>   DW_AT_name        : (indirect string, offset: 0x18c8): PTA_3DNOW
    <1228>   DW_AT_decl_file   : 20
    <1228>   DW_AT_decl_line   : 2394
    <122a>   DW_AT_decl_column : 24
    <122a>   DW_AT_type        : <0x1204>
The DW_AT_decl_file uses DW_FORM_implicit_const 20, and that is fine given
corresponding:
 The File Name Table (offset 0x194):
  Entry Dir     Time    Size    Name
  1     1       0       0       gencheck.c
  2     1       0       0       wide-int-bitmask.h
  3     2       0       0       stddef.h
  4     3       0       0       types.h
  5     4       0       0       struct_FILE.h
  6     4       0       0       FILE.h
  7     5       0       0       cstring
  8     5       0       0       type_traits
  9     5       0       0       cstdlib
  10    6       0       0       std_abs.h
  11    7       0       0       string.h
  12    7       0       0       stdlib.h
  13    3       0       0       stdlib-float.h
  14    3       0       0       stdlib-bsearch.h
  15    5       0       0       stdlib.h
  16    3       0       0       stdint-uintn.h
  17    8       0       0       c++config.h
  18    1       0       0       flag-types.h
  19    7       0       0       stdio.h
  20    9       0       0       i386.h
  21    1       0       0       wide-int.h
But somehow the cu we see during reading has only fewer files than that.

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