Java: Add a test for cycles in the type hierarchy

Author: igfoo

java/ql/test/library-tests/types/cycles/Test.java

@@ -0,0 +1,2 @@
+public class Test {
+}

java/ql/test/library-tests/types/cycles/cycles.expected

@@ -0,0 +1,6 @@
+| BiFunction<? super Object,? super Object,? extends Object> |
+| BiFunction<? super Object,? super Object,?> |
+| Function<? super Object,? extends Object> |
+| Function<? super Object,?> |
+| Map<? extends Object,? extends Object> |
+| Map<?,?> |

java/ql/test/library-tests/types/cycles/cycles.ql

@@ -0,0 +1,5 @@
+import java
+
+from RefType t
+where t = t.getAStrictAncestor()
+select t.toString()