[Bug default/30260] add support for pointer-to-member types

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

https://sourceware.org/bugzilla/show_bug.cgi?id=30260

--- Comment #7 from dodji at redhat dot com ---
Thanks.

The output of abidiff looks like this:

Functions changes summary: 0 Removed, 0 Changed, 0 Added function
Variables changes summary: 0 Removed, 1 Changed, 0 Added variable

1 Changed variable:

  [C] 'int S::* pm' was changed to 'char S::* pm' at
test-ptr-to-mbr1-v1.cc:6:1:
    type of variable changed:
      pointer-to-member type changed from: 'int S::* to: 'char S::*'
      in data member type 'int' of pointed-to-member type 'int S::*':
        type name changed from 'int' to 'char'
        type size changed from 32 to 8 (in bits)
      in containing type 'struct S' of pointed-to-member type 'int S::*' at
test-ptr-to-mbr1-v1.cc:1:1:
        type size changed from 32 to 8 (in bits)
        1 data member change:
          type of 'int m' changed:
            type name changed from 'int' to 'char'
            type size changed from 32 to 8 (in bits)

The output of the relevant tests are available at
https://sourceware.org/git/?p=libabigail.git;a=tree;f=tests/data/test-abidiff-exit/pointer-to-member;h=61ced53e13335af7b31962b8a3736774be5b68db;hb=HEAD.

And one such output is:

https://sourceware.org/git/?p=libabigail.git;a=blob;f=tests/data/test-abidiff-exit/pointer-to-member/test-ptr-to-mbr1-output-1.txt;h=a88d96fbec1d301d52e57f5f6a6e233d97de62b1;hb=HEAD

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