bpo-29505: Add more fuzzing for re.compile, re.load and csv.reader (GH-14255)


Add more fuzz testing for re.compile, re.load and csv.reader
(cherry picked from commit 5cbbbd73a6acb6f96f5d6646aa7498d3dfb1706d)

Co-authored-by: Ammar Askar <ammar@ammaraskar.com>
diff --git a/Lib/test/test_xxtestfuzz.py b/Lib/test/test_xxtestfuzz.py
index 532f5fe..15924aa 100644
--- a/Lib/test/test_xxtestfuzz.py
+++ b/Lib/test/test_xxtestfuzz.py
@@ -16,6 +16,8 @@
         _xxtestfuzz.run(b" ")
         _xxtestfuzz.run(b"x")
         _xxtestfuzz.run(b"1")
+        _xxtestfuzz.run(b"AAAAAAA")
+        _xxtestfuzz.run(b"AAAAAA\0")
 
 
 if __name__ == "__main__":