JVM IR: Generate SAM wrapper fields as synthetic final

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrDeclarationOrigin.kt

@@ -69,6 +69,7 @@ interface IrDeclarationOrigin {
     object ADAPTER_PARAMETER_FOR_SUSPEND_CONVERSION : IrDeclarationOriginImpl("ADAPTER_PARAMETER_FOR_SUSPEND_CONVERSION")
 
     object GENERATED_SAM_IMPLEMENTATION : IrDeclarationOriginImpl("GENERATED_SAM_IMPLEMENTATION")
+    object SYNTHETIC_GENERATED_SAM_IMPLEMENTATION : IrDeclarationOriginImpl("SYNTHETIC_GENERATED_SAM_IMPLEMENTATION", isSynthetic = true)
 
     val isSynthetic: Boolean get() = false
 }