Run CheckOperatorsOverloadsPass under both backends.

src/Generator/Driver.cs

@@ -135,6 +135,7 @@ namespace CppSharp
             TranslationUnitPasses.AddPass(new CheckIgnoredDeclsPass());
             TranslationUnitPasses.AddPass(new FindSymbolsPass());
             TranslationUnitPasses.AddPass(new MoveOperatorToClassPass());
+            TranslationUnitPasses.AddPass(new CheckOperatorsOverloadsPass());
 
             library.SetupPasses(this);
 

src/Generator/Generators/CSharp/CSharpGenerator.cs

@@ -31,7 +31,6 @@ namespace CppSharp.Generators.CSharp
             // CheckAbiParameters runs last because hidden structure parameters
             // should always occur first.
 
-            Driver.AddTranslationUnitPass(new CheckOperatorsOverloadsPass());
             Driver.AddTranslationUnitPass(new CheckAbiParameters(Driver.Options));
 
             return true;