[K/N] Supported outer this references from cached inline bodies

kotlin-native/backend.native/tests/codegen/innerClass/inheritance_linkTest_lib.kt

@@ -0,0 +1,10 @@
+/*
+ * 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.
+ */
+
+open class Foo(val z: Int) {
+    open inner class FooInner {
+        fun foo() = z
+    }
+}