[Bug default/26998] abidiff --leaf-changes-only misreports array member changes

["gprocida+abigail at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26998

--- Comment #1 from Giuliano Procida <gprocida+abigail at google dot com> ---
Here's another even smaller test case that has similar issues.

$ head -100 small.?.c
==> small.0.c <==
struct buzz {
  int a;
};

struct flexible {
  struct buzz lightyear[0];
};

struct flexible impacted;

==> small.1.c <==
struct buzz {
  long a;
};

struct flexible {
  struct buzz lightyear[0];
};

struct flexible impacted;
$ for x in small.{0,1}.c; do gcc -Wall -Wextra -g -c $x; done
$ for x in small.{0,1}; do abidw $x.o > $x.abi; done
$ abidiff --leaf-changes-only small.?.o
Leaf changes summary: 3 artifacts changed
Changed leaf types summary: 2 leaf types changed
Removed/Changed/Added functions summary: 0 Removed, 0 Changed, 0 Added function
Removed/Changed/Added variables summary: 0 Removed, 1 Changed, 0 Added variable

1 Changed variable:

  [C] 'flexible impacted' was changed at small.1.c:9:1:
    type of variable changed:
      type size hasn't changed
      there are data member changes:
        'buzz flexible::lightyear[]' has *some* difference - please report as a
bug

'struct buzz at small.0.c:1:1' changed:
  type size changed from 32 to 64 (in bits)
  there are data member changes:
    type 'int' of 'buzz::a' changed:
      type name changed from 'int' to 'long int'
      type size changed from 32 to 64 (in bits)

'struct flexible at small.0.c:5:1' changed:
  details were reported earlier
$ diff <(abidiff --leaf-changes-only small.?.o) <(abidiff --leaf-changes-only
small.?.abi)

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