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/stdlib_external/utils.kt

@@ -0,0 +1,31 @@
+/*
+ * 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 test
+
+import kotlin.test.*
+
+public actual fun assertTypeEquals(expected: Any?, actual: Any?) {
+    if (expected != null && actual != null) {
+        assertTrue(expected::class.isInstance(actual) || actual::class.isInstance(expected),
+                "Expected: $expected,  Actual: $actual")
+    } else {
+        assertTrue(expected == null && actual == null)
+    }
+}
+
+internal actual fun String.removeLeadingPlusOnJava6(): String = this
+
+internal actual inline fun testOnNonJvm6And7(f: () -> Unit) {
+    f()
+}
+
+actual fun testOnJvm(action: () -> Unit) {}
+actual fun testOnJs(action: () -> Unit) {}
+
+
+public actual val isFloat32RangeEnforced: Boolean get() = true
+
+public actual val supportsSuppressedExceptions: Boolean get() = true