FIR2IR: convert enums with non-primary default ctor correctly

see added test for example

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/IrUtils.kt

@@ -213,6 +213,9 @@ val IrClassSymbol.functions: Sequence<IrSimpleFunctionSymbol>
 val IrClass.constructors: Sequence<IrConstructor>
     get() = declarations.asSequence().filterIsInstance<IrConstructor>()
 
+val IrClass.defaultConstructor: IrConstructor?
+    get() = constructors.firstOrNull { ctor -> ctor.valueParameters.all { it.defaultValue != null } }
+
 val IrClassSymbol.constructors: Sequence<IrConstructorSymbol>
     get() = owner.constructors.map { it.symbol }