[Tests] Migrate backend-independent tests from native to compiler/testData.

^KT-65979

compiler/testData/codegen/box/funInterface/kt49384.kt

@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+// WITH_STDLIB
+
+import kotlin.test.*
+
+interface A<T>
+
+// https://youtrack.jetbrains.com/issue/KT-49384
+class B<T> {
+    init {
+        mutableListOf<A<out T>>()
+                .sortWith { _, _ -> 1 }
+    }
+}
+
+fun box(): String {
+    val b = B<Any>()
+    assertEquals(b, b) // Just to ensure B is not deleted by DCE
+
+    return "OK"
+}