When building the passes also call the generator so it can setup its specific passes.

src/Generator/Driver.cs

@@ -135,6 +135,8 @@ namespace CppSharp
 
             library.SetupPasses(this);
 
+            Generator.SetupPasses();
+
             TranslationUnitPasses.AddPass(new CleanInvalidDeclNamesPass());
             TranslationUnitPasses.AddPass(new CheckIgnoredDeclsPass());
             TranslationUnitPasses.AddPass(new CheckFlagEnumsPass());