C++: add upgrade and downgrade scripts

cpp/ql/lib/upgrades/0f0a390468a5eb43d1dc72937c028070b106bf53/aggregate_array_init.ql

@@ -0,0 +1,11 @@
+class Expr extends @expr {
+  string toString() { none() }
+}
+
+class AggregateLiteral extends Expr, @aggregateliteral {
+  override string toString() { none() }
+}
+
+from AggregateLiteral aggregate, Expr initializer, int element_index, int position
+where aggregate_array_init(aggregate, initializer, element_index, position)
+select aggregate, initializer, element_index, position, false

cpp/ql/lib/upgrades/0f0a390468a5eb43d1dc72937c028070b106bf53/aggregate_field_init.ql

@@ -0,0 +1,15 @@
+class Expr extends @expr {
+  string toString() { none() }
+}
+
+class AggregateLiteral extends Expr, @aggregateliteral {
+  override string toString() { none() }
+}
+
+class MemberVariable extends @membervariable {
+  string toString() { none() }
+}
+
+from AggregateLiteral aggregate, Expr initializer, MemberVariable field, int position
+where aggregate_field_init(aggregate, initializer, field, position)
+select aggregate, initializer, field, position, false

cpp/ql/lib/upgrades/0f0a390468a5eb43d1dc72937c028070b106bf53/upgrade.properties

@@ -0,0 +1,4 @@
+description: add `isDesignatorInit`predicate to `ArrayOrVectorAggregateLiteral` and `ClassAggregateLiteral`
+compatibility: backwards
+aggregate_array_init.rel: run aggregate_array_init.qlo
+aggregate_field_init.rel: run aggregate_field_init.qlo