This file is indexed.

/usr/src/gcc-4.8/debian/lib64atomic1.symbols is in gcc-4.8-source 4.8.5-4ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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libatomic.so.1 lib64atomic1 #MINVER#
#include "libatomic1.symbols.common"
#include "libatomic1.symbols.64"