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/devirtualization/anonymousObject.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2010-2019 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.
+ */
+
+interface I {
+    fun foo()
+}
+
+fun test() {
+    val impl = object : I {
+        override fun foo() { println("zzz") }
+    }
+
+    val delegating = object: I by impl { }
+
+    delegating.foo()
+}
+
+fun main() {
+    test()
+}

kotlin-native/backend.native/tests/codegen/devirtualization/getter_looking_as_box_function.kt

@@ -0,0 +1,5 @@
+class Foo(val box: String = "box")
+
+fun main() {
+    println(Foo().box)
+}

kotlin-native/backend.native/tests/codegen/devirtualization/lateinitInterface.kt

@@ -0,0 +1,14 @@
+interface I {
+    fun foo(): Int
+}
+
+class A : I {
+    override fun foo() = 42
+}
+
+fun main(args: Array<String>) {
+    lateinit var a: I
+    if (args.size == 0)
+        a = A()
+    println(a.foo())
+}