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/framework/gh3343/ktlib.kt

@@ -0,0 +1,15 @@
+import kotlinx.cinterop.*
+import objclib.*
+import kotlin.native.ref.*
+
+fun run(): List<Any?> {
+    val result = mutableListOf<Any?>()
+    result.add(foo1(42))
+    val list = foo2(117)
+    if (list != null) {
+        result.add(list.size)
+        for (x in list)
+            result.add(x)
+    }
+    return result
+}

kotlin-native/backend.native/tests/framework/gh3343/objclib.def

@@ -0,0 +1,3 @@
+language = Objective-C
+headers = Foundation/NSArray.h Foundation/NSValue.h Foundation/NSString.h
+headerFilter = **/objclib.h Foundation/NSArray.h Foundation/NSValue.h Foundation/NSString.h

kotlin-native/backend.native/tests/framework/gh3343/objclib.h

@@ -0,0 +1,11 @@
+#import <Foundation/Foundation.h>
+
+NSString* foo1(int x) {
+  return [NSString stringWithFormat:@"%d", x];
+}
+
+NSArray* foo2(int x) {
+  NSValue* xx = @(x);
+  NSString* s = @"zzz";
+  return [NSArray arrayWithObjects: xx, s, nil];
+}

kotlin-native/backend.native/tests/framework/gh3343/uselib.swift

@@ -0,0 +1,23 @@
+import Foundation
+import Gh3343
+
+func testGh3343() throws {
+    let list = KtlibKt.run()
+    try assertEquals(actual: list[0] as? String, expected: "42")
+    try assertEquals(actual: list[1] as? Int, expected: 2)
+    try assertEquals(actual: list[2] as? Int, expected: 117)
+    try assertEquals(actual: list[3] as? String, expected: "zzz")
+}
+
+// -------- Execution of the test --------
+
+class UselibTests : TestProvider {
+    var tests: [TestCase] = []
+
+    init() {
+        providers.append(self)
+        tests = [
+            TestCase(name: "Gh3343", method: withAutorelease(testGh3343)),
+        ]
+    }
+}