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

^KT-61259

native/native.tests/testData/framework/objcexport/variance.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2010-2021 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.
+ */
+
+package variance
+
+sealed class InvariantSuper<T>
+class Invariant<T> : InvariantSuper<T>()
+
+sealed class OutVariantSuper<out T>
+class OutVariant<out T> : OutVariantSuper<T>()
+
+sealed class InVariantSuper<in T>
+class InVariant<in T> : InVariantSuper<T>()