[K/N] Move kotlin.native.internal.GC into kotlin.native.runtime

As a part of efforts to stabilize Native stdlib #KT-55765.

kotlin-native/performance/ring/src/main/kotlin-native/cleanup.kt

@@ -1,5 +1,6 @@
 package org.jetbrains.ring
 
-import kotlin.native.internal.GC
+import kotlin.native.runtime.GC
 
+@OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
 actual fun cleanup() { GC.collect() }

kotlin-native/performance/ring/src/main/kotlin/org/jetbrains/ring/WeakRefBenchmark.kt

@@ -5,7 +5,7 @@
 
 package org.jetbrains.ring
 
-import kotlin.native.internal.GC
+import kotlin.native.runtime.GC
 import kotlin.native.ref.WeakReference
 import kotlin.test.assertEquals
 import kotlin.test.assertNotEquals
@@ -46,6 +46,7 @@ private fun ReferenceWrapper.stress() = (1..REPEAT_COUNT).sumOf {
     this.value
 }
 
+@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
 open class WeakRefBenchmark {
     private val aliveRef = ReferenceWrapper.create()
     private val deadRef = ReferenceWrapper.create().apply {

kotlin-native/performance/shared/src/main/kotlin-native/common/org/jetbrains/benchmarksLauncher/Utils.kt

@@ -16,7 +16,7 @@
 
 package org.jetbrains.benchmarksLauncher
 
-import kotlin.native.internal.GC
+import kotlin.native.runtime.GC
 import platform.posix.*
 import kotlinx.cinterop.*
 
@@ -39,6 +39,7 @@ actual inline fun measureNanoTime(block: () -> Unit): Long {
     return kotlin.system.measureNanoTime(block)
 }
 
+@OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
 actual fun cleanup() {
     GC.collect()
 }

kotlin-native/performance/swiftinterop/src/main/kotlin/org/jetbrains/GC.kt

@@ -2,10 +2,11 @@
  * Copyright 2010-2022 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.
  */
+@file:OptIn(kotlin.native.runtime.NativeRuntimeApi::class)
 
 package org.jetbrains.gc
 
-import kotlin.native.internal.GC
+import kotlin.native.runtime.GC
 
 fun collect() = GC.collect()
 fun schedule() = GC.schedule()