Fix anonymous unions inside template classes

Author: josetr

src/Generator/Passes/FlattenAnonymousTypesToFields.cs

@@ -16,7 +16,7 @@ public FlattenAnonymousTypesToFields() =>
 
         public override bool VisitClassDecl(Class @class)
         {
-            if (!base.VisitClassDecl(@class) || @class.Ignore || @class.IsDependent)
+            if (!base.VisitClassDecl(@class) || @class.Ignore)
                 return false;
 
             for (int i = @class.Fields.Count - 1; i >= 0; i--)

tests/CSharp/CSharpTemplates.h

@@ -221,6 +221,25 @@ void Base<T>::invokeFriend()
     f(Nested());
 }
 
+template <typename T>
+struct TemplateUnionField
+{
+    union
+    {
+        struct
+        {
+            T x, y, z;
+        };
+        T v;
+    };
+};
+
+struct TemplateUnionFieldInstantiation
+{
+    TemplateUnionField<int> tuf;
+    TemplateUnionField<float> tuf1;
+};
+
 template <typename T>
 class DependentValueFields : public Base<T>
 {