[IR] Native version of DefaultArgumentStubGenerator

By default, DefaultArgumentStubGenerator produces IrSetValue to IrValueParameter
which is not supported, so replace it with a temp creation and setting into it

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanLoweringPhases.kt

@@ -217,7 +217,7 @@ internal val tailrecPhase = makeKonanFileLoweringPhase(
 
 internal val defaultParameterExtentPhase = makeKonanFileOpPhase(
         { context, irFile ->
-            DefaultArgumentStubGenerator(context, skipInlineMethods = false).lower(irFile)
+            KonanDefaultArgumentStubGenerator(context).lower(irFile)
             DefaultParameterCleaner(context, replaceDefaultValuesWithStubs = true).lower(irFile)
             KonanDefaultParameterInjector(context).lower(irFile)
         },

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/KonanDefaultArgumentStubGenerator.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+package org.jetbrains.kotlin.backend.konan.lower
+
+import org.jetbrains.kotlin.backend.common.lower.DefaultArgumentStubGenerator
+import org.jetbrains.kotlin.backend.konan.Context
+import org.jetbrains.kotlin.ir.builders.*
+import org.jetbrains.kotlin.ir.declarations.IrValueDeclaration
+import org.jetbrains.kotlin.ir.declarations.IrValueParameter
+import org.jetbrains.kotlin.ir.expressions.IrExpression
+
+internal class KonanDefaultArgumentStubGenerator(override val context: Context)
+    : DefaultArgumentStubGenerator(context, skipInlineMethods = false)
+{
+    override fun IrBlockBodyBuilder.selectArgumentOrDefault(
+            defaultFlag: IrExpression,
+            parameter: IrValueParameter,
+            default: IrExpression
+    ): IrValueDeclaration {
+        val value = irIfThenElse(parameter.type, irNotEquals(defaultFlag, irInt(0)), default, irGet(parameter))
+        return createTmpVariable(value, nameHint = parameter.name.asString())
+    }
+}