C#: Add some testcases, where we don't get a summary due to the use of simple types.

Author: michaelnebel

csharp/ql/test/utils/model-generator/NoSummaries.cs

@@ -60,4 +60,29 @@ public bool Equals(T? other)
     {
         return tainted;
     }
+}
+
+// No methods in this class will have generated flow summaries as
+// simple types are used.
+public class SimpleTypes
+{
+    public bool M1(bool b)
+    {
+        return b;
+    }
+
+    public Boolean M2(Boolean b)
+    {
+        return b;
+    }
+
+    public int M3(int i)
+    {
+        return i;
+    }
+
+    public Int32 M4(Int32 i)
+    {
+        return i;
+    }
 }