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/performance/ring/build.gradle.kts

@@ -0,0 +1,24 @@
+import org.jetbrains.kotlin.gradle.plugin.mpp.NativeBuildType
+
+/*
+ * 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.
+ */
+
+plugins {
+    id("benchmarking")
+}
+
+val defaultBuildType = NativeBuildType.RELEASE
+
+benchmark {
+    applicationName = "Ring"
+    commonSrcDirs = listOf("../../tools/benchmarks/shared/src/main/kotlin/report", "src/main/kotlin", "../shared/src/main/kotlin")
+    jvmSrcDirs = listOf("src/main/kotlin-jvm", "../shared/src/main/kotlin-jvm")
+    nativeSrcDirs = listOf("src/main/kotlin-native", "../shared/src/main/kotlin-native/common")
+    mingwSrcDirs = listOf("src/main/kotlin-native", "../shared/src/main/kotlin-native/mingw")
+    posixSrcDirs = listOf("src/main/kotlin-native", "../shared/src/main/kotlin-native/posix")
+    buildType = (findProperty("nativeBuildType") as String?)?.let { NativeBuildType.valueOf(it) } ?: defaultBuildType
+
+    dependencies.common(project(":endorsedLibraries:kotlinx.cli"))
+}