C++: Add upgrade and downgrade scripts

cpp/downgrades/1402ab319d20cdc9289deb7bfc1c70f36be44d44/exprs.ql

@@ -0,0 +1,17 @@
+class Expr extends @expr {
+  string toString() { none() }
+}
+
+class Location extends @location_default {
+  string toString() { none() }
+}
+
+predicate isExprWithNewBuiltin(Expr expr) {
+  exists(int kind | exprs(expr, kind, _) | 394 <= kind and kind <= 396)
+}
+
+from Expr expr, int kind, int kind_new, Location location
+where
+  exprs(expr, kind, location) and
+  if isExprWithNewBuiltin(expr) then kind_new = 1 else kind_new = kind
+select expr, kind_new, location

cpp/downgrades/1402ab319d20cdc9289deb7bfc1c70f36be44d44/upgrade.properties

@@ -0,0 +1,4 @@
+description: Add new builtin operations and this parameter access table
+compatibility: partial
+exprs.rel: run exprs.qlo
+param_ref_to_this.rel: delete

cpp/ql/lib/upgrades/d2d611b3fdcc7c4fe370f0d115200a3aa6ad5837/upgrade.properties

@@ -0,0 +1,2 @@
+description: Add new builtin operations and this parameter access table
+compatibility: backwards