[K/N][Tests] Migrate framework and objcexport tests

^KT-61259

native/native.tests/testData/framework/kt42397/kt42397.kt

@@ -0,0 +1,20 @@
+@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
+
+import kotlin.native.Platform
+
+// The following 2 singletons are unused. However, since we are generating ObjC bindings for them,
+// they should be marked as used, so that the code generator emits their deinitialization.
+
+object A {
+    fun foo() = 1
+}
+
+class B {
+    companion object {
+        fun foo() = 2
+    }
+}
+
+fun enableMemoryChecker() {
+    Platform.isMemoryLeakCheckerActive = true
+}