/usr/lib/perl5/auto/Pg/autosplit.ix is in libpg-perl 1:2.1.1-4build3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Index created by AutoSplit for blib/lib/Pg.pm
# (file acts as timestamp)
1;
|