Swift: Expose the generic arguments of BuiltinFixedArrays

Author: jketema

swift/downgrades/5738be6bb04742c424efdbf9f4de11f0b10fa37d/builtin_fixed_array_types.ql

@@ -0,0 +1,7 @@
+class BuiltinFixedArrayType extends @builtin_fixed_array_type {
+  string toString() { none() }
+}
+
+from BuiltinFixedArrayType builtinFixedArrayType
+where builtin_fixed_array_types(builtinFixedArrayType, _, _)
+select builtinFixedArrayType