Do per-generator pass initialization and switch the C# generator to use it.

src/Generator/Generators/CSharp/CSharpGenerator.cs

@@ -22,5 +22,13 @@ namespace CppSharp.Generators.CSharp
 
             return true;
         }
+
+        public override bool SetupPasses(PassBuilder builder)
+        {
+            builder.CheckAbiParameters(Driver.Options);
+            builder.CheckOperatorOverloads();
+
+            return true;
+        }
     }
 }

src/Generator/Generators/Generator.cs

@@ -42,6 +42,10 @@ namespace CppSharp.Generators
         public abstract bool Generate(TranslationUnit unit,
             List<GeneratorOutput> outputs);
 
+        /// <summary>
+        /// Setup any generator-specific passes here.
+        /// </summary>
+        public abstract bool SetupPasses(PassBuilder builder);
 
         protected string GetOutputPath(TranslationUnit unit)
         {