[K/N][tests] Migrate various runtime/ tests ^KT-61259

native/native.tests/testData/gc/weak1.kt

@@ -0,0 +1,13 @@
+import kotlin.test.*
+import kotlin.native.ref.*
+
+class Node(var next: Node?)
+
+@OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+@Test fun runTest1() {
+    val node1 = Node(null)
+    val node2 = Node(node1)
+    node1.next = node2
+
+    WeakReference(node1)
+}