Fix private setter visibility for generic class

#KT-8888 fixed

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/PropertyDescriptorImpl.java

@@ -256,7 +256,7 @@ public class PropertyDescriptorImpl extends VariableDescriptorWithInitializerImp
         substitutedDescriptor.setType(outType, substitutedTypeParameters, substitutedDispatchReceiver, substitutedReceiverType);
 
         PropertyGetterDescriptorImpl newGetter = getter == null ? null : new PropertyGetterDescriptorImpl(
-                substitutedDescriptor, getter.getAnnotations(), newModality, convertVisibility(getter.getVisibility(), newVisibility),
+                substitutedDescriptor, getter.getAnnotations(), newModality, getter.getVisibility(),
                 getter.hasBody(), getter.isDefault(), getter.isExternal(), kind, original == null ? null : original.getGetter(), SourceElement.NO_SOURCE
         );
         if (newGetter != null) {
@@ -264,7 +264,7 @@ public class PropertyDescriptorImpl extends VariableDescriptorWithInitializerImp
             newGetter.initialize(returnType != null ? substitutor.substitute(returnType, Variance.OUT_VARIANCE) : null);
         }
         PropertySetterDescriptorImpl newSetter = setter == null ? null : new PropertySetterDescriptorImpl(
-                substitutedDescriptor, setter.getAnnotations(), newModality, convertVisibility(setter.getVisibility(), newVisibility),
+                substitutedDescriptor, setter.getAnnotations(), newModality, setter.getVisibility(),
                 setter.hasBody(), setter.isDefault(), setter.isExternal(), kind, original == null ? null : original.getSetter(), SourceElement.NO_SOURCE
         );
         if (newSetter != null) {