Add test that tsort fails (incorrect detection of cycle).

Based on a test case found by Dragos Ruiu (dr@kyx.net)

1 files changed, 1742 insertions, 0 deletions

diff --git a/regress/usr.bin/tsort/pairs6 b/regress/usr.bin/tsort/pairs6
new file mode 100644
index 00000000000..d74941da15f
--- /dev/null
+++ b/regress/usr.bin/tsort/pairs6
@@ -0,0 +1,1742 @@
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