C#: Add unsigned right shift operator test case.

Author: michaelnebel

csharp/ql/test/library-tests/csharp11/Operators.cs

@@ -12,4 +12,9 @@ public void M1()
         var z = -4;
         z >>>= 5;
     }
+}
+
+public class MyOperatorClass
+{
+    public static MyOperatorClass operator >>>(MyOperatorClass a, MyOperatorClass b) { return null; }
 }

csharp/ql/test/library-tests/csharp11/operators.expected

@@ -4,3 +4,5 @@ binarybitwise
 | Operators.cs:13:9:13:16 | ... >>> ... | Operators.cs:13:9:13:9 | access to local variable z | Operators.cs:13:16:13:16 | 5 | >>> | UnsignedRightShiftExpr |
 assignbitwise
 | Operators.cs:13:9:13:16 | ... >>>= ... | Operators.cs:13:9:13:9 | access to local variable z | Operators.cs:13:16:13:16 | 5 | >>>= | AssignUnsighedRightShiftExpr |
+userdefined
+| Operators.cs:19:44:19:46 | >>> | op_UnsignedRightShift | UnsignedRightShiftOperator |

csharp/ql/test/library-tests/csharp11/operators.ql

@@ -19,3 +19,9 @@ query predicate assignbitwise(
   name = op.getOperator() and
   qlclass = op.getAPrimaryQlClass()
 }
+
+query predicate userdefined(Operator op, string fname, string qlclass) {
+  op.getFile().getStem() = "Operators" and
+  fname = op.getFunctionName() and
+  qlclass = op.getAPrimaryQlClass()
+}