Add test for function pointer diffing.

Bug: 71486762

Test: tests/test.py

Merged-In: Id956804c36b0c06b4e6259d6864438974ed18267
Change-Id: Id956804c36b0c06b4e6259d6864438974ed18267
(cherry picked from commit bab864d2d04d359012dc132610f00156d2df600a)
3 files changed