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/helloworld/build.gradle.kts

@@ -0,0 +1,29 @@
+/*
+ * 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.
+ */
+
+import org.jetbrains.kotlin.getNativeProgramExtension
+import org.jetbrains.kotlin.getCompileOnlyBenchmarksOpts
+
+plugins {
+    id("compile-benchmarking")
+}
+
+val dist = file(findProperty("kotlin.native.home") ?: "dist")
+val toolSuffix = if (System.getProperty("os.name").startsWith("Windows")) ".bat" else ""
+val binarySuffix = getNativeProgramExtension()
+val defaultCompilerOpts =  listOf("-g")
+val buildOpts = getCompileOnlyBenchmarksOpts(project, defaultCompilerOpts)
+
+compileBenchmark {
+    applicationName = "HelloWorld"
+    repeatNumber = 10
+    compilerOpts = buildOpts
+    buildSteps {
+        step("runKonanc") {
+            command("$dist/bin/konanc$toolSuffix", "$projectDir/src/main/kotlin/main.kt", "-o",
+                    "$buildDir/program$binarySuffix", *(buildOpts.toTypedArray()))
+        }
+    }
+}

kotlin-native/performance/helloworld/gradle.properties

@@ -0,0 +1 @@
+kotlin.native.home=../../dist

kotlin-native/performance/helloworld/src/main/kotlin/main.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+fun main() {
+    println("Hello, World!")
+}