It would be nice to add some unit/regression test cases of some sort.

File callgraph.c (right):
callgraph.c:309: if (!is_prefix_of ("_ZL", name))
How about static functions in namespace? How about functions in
anonymous namespace?
callgraph.c:511: ".text." };
How are the sections ordered in the array?  Keep it in mind that it is
possible to encode the actual profile count of the function in the
section name in the future.

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