Handle @Serializable classes that implement interfaces by delegation

by filtering out delegated properties that end up in irClass.properties() list

Fixes https://github.com/Kotlin/kotlinx.serialization/issues/2157

plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/IrSerializableProperties.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -8,6 +8,7 @@ package org.jetbrains.kotlinx.serialization.compiler.backend.ir
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.declarations.IrClass
+import org.jetbrains.kotlin.ir.declarations.IrDeclarationOrigin
 import org.jetbrains.kotlin.ir.declarations.IrProperty
 import org.jetbrains.kotlin.ir.types.IrSimpleType
 import org.jetbrains.kotlin.ir.util.*
@@ -78,7 +79,7 @@ internal fun serializablePropertiesForIrBackend(
 
     val (primaryCtorSerializableProps, bodySerializableProps) = properties
         .asSequence()
-        .filter { !it.isFakeOverride && !it.isDelegated }
+        .filter { !it.isFakeOverride && !it.isDelegated && it.origin != IrDeclarationOrigin.DELEGATED_MEMBER }
         .filter(::isPropSerializable)
         .map {
             val isConstructorParameterWithDefault = primaryParamsAsProps[it] ?: false