Move everything under kotlin-native folder

I was forced to manually do update the following files, because otherwise
they would be ignored according .gitignore settings. Probably they
should be deleted from repo.

Interop/.idea/compiler.xml
Interop/.idea/gradle.xml
Interop/.idea/libraries/Gradle__org_jetbrains_kotlin_kotlin_runtime_1_0_3.xml
Interop/.idea/libraries/Gradle__org_jetbrains_kotlin_kotlin_stdlib_1_0_3.xml
Interop/.idea/modules.xml
Interop/.idea/modules/Indexer/Indexer.iml
Interop/.idea/modules/Runtime/Runtime.iml
Interop/.idea/modules/StubGenerator/StubGenerator.iml
backend.native/backend.native.iml
backend.native/bc.frontend/bc.frontend.iml
backend.native/cli.bc/cli.bc.iml
backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt
backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.kt
backend.native/tests/link/lib/foo.kt
backend.native/tests/link/lib/foo2.kt
backend.native/tests/teamcity-test.property

kotlin-native/backend.native/tests/codegen/enum/companionObject.kt

@@ -0,0 +1,33 @@
+/*
+ * 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 codegen.enum.companionObject
+
+import kotlin.test.*
+
+enum class Game {
+    ROCK,
+    PAPER,
+    SCISSORS;
+
+    companion object {
+        fun foo() = ROCK
+        val bar = PAPER
+        val values2 = values()
+        val scissors = valueOf("SCISSORS")
+    }
+}
+
+fun box(): String {
+    if (Game.foo() != Game.ROCK) return "Fail 1"
+    if (Game.bar != Game.PAPER) return "Fail 2: ${Game.bar}"
+    if (Game.values().size != 3) return "Fail 3"
+    if (Game.valueOf("SCISSORS") != Game.SCISSORS) return "Fail 4"
+    if (Game.values2.size != 3) return "Fail 5"
+    if (Game.scissors != Game.SCISSORS) return "Fail 6"
+    return "OK"
+}
+
+@Test fun runTest() = println(box())