C++: Add upgrade and downgrade scripts for new builtins

cpp/downgrades/23f7cbb88a4eb29f30c3490363dc201bc054c5ff/exprs.ql

@@ -0,0 +1,17 @@
+class Expr extends @expr {
+  string toString() { none() }
+}
+
+class Location extends @location_expr {
+  string toString() { none() }
+}
+
+predicate isExprWithNewBuiltin(Expr expr) {
+  exists(int kind | exprs(expr, kind, _) | 330 <= kind and kind <= 334)
+}
+
+from Expr expr, int kind, int kind_new, Location location
+where
+  exprs(expr, kind, location) and
+  if isExprWithNewBuiltin(expr) then kind_new = 0 else kind_new = kind
+select expr, kind_new, location

cpp/downgrades/23f7cbb88a4eb29f30c3490363dc201bc054c5ff/upgrade.properties

@@ -0,0 +1,3 @@
+description: Add new builtin operations
+compatibility: partial
+exprs.rel: run exprs.qlo

cpp/ql/lib/upgrades/19e31bf071f588bb7efd1e4d5a185ce4f6fbbd84/upgrade.properties

@@ -0,0 +1,2 @@
+description: Add new builtin operations
+compatibility: backwards