C#: Add upgrade- and downgrade scripts for unsigned right shift operators.

Author: michaelnebel

csharp/downgrades/d0fba103f7dee477dd7d9f6c038518b3f683b2c7/expressions.ql

@@ -0,0 +1,13 @@
+class Expression extends @expr {
+  string toString() { none() }
+}
+
+class TypeOrRef extends @type_or_ref {
+  string toString() { none() }
+}
+
+from Expression e, int k, int kind, TypeOrRef t
+where
+  expressions(e, k, t) and
+  if k = [133, 134] then kind = 106 else kind = k
+select e, kind, t