[K/N][Tests] Move codegen test sources cycles..innerClass

^KT-61259

native/native.tests/testData/codegen/function/extension.kt

@@ -0,0 +1,8 @@
+/*
+ * Copyright 2010-2018 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.
+ */
+
+class B(val a: Int)
+
+fun B.foo() = this.a